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CCD PHOTOMETRY AND EVOLUTIONARY STATUS OF THE HADS VARIABLE PT COM CCD测光与HADS变量PT-COM的发展现状
IF 1 4区 物理与天体物理
Revista Mexicana de Astronomia y Astrofisica Pub Date : 2022-04-01 DOI: 10.22201/ia.01851101p.2022.58.01.09
K. Alton
{"title":"CCD PHOTOMETRY AND EVOLUTIONARY STATUS OF THE HADS VARIABLE PT COM","authors":"K. Alton","doi":"10.22201/ia.01851101p.2022.58.01.09","DOIUrl":"https://doi.org/10.22201/ia.01851101p.2022.58.01.09","url":null,"abstract":"Multi-color (BVIc) CCD-derived photometric data were acquired from PT Com, a pulsating variable classified as a high amplitude δ Scuti-type system. Analysis of precise time-series lightcurve data was accomplished using discrete Fourier transformation which revealed a mean fundamental mode (f0) of oscillation at 12.178364 ± 0.000083 d−1 along with at least three other partial harmonics (2f0, 3f0 and 4f0). No other statistically significant frequency shared by all bandpasses was resolved following successive pre-whitening of each residual signal. A secular analysis of the fundamental pulse period since 1999 was facilitated by the addition of 35 new times-of-maximum. The evolutionary status, age and physical nature of PT Com were investigated using the PAdova & TRieste Stellar Evolution Code for generating stellar tracks and isochrones.","PeriodicalId":49602,"journal":{"name":"Revista Mexicana de Astronomia y Astrofisica","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43652361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
CZEV502 – AN M DWARF NEAR THE LEO TRIPLET WITH VERY STRONG FLARES CZEV502–狮子座三重态附近的一颗M矮星，具有非常强的耀斑
IF 1 4区 物理与天体物理
Revista Mexicana de Astronomia y Astrofisica Pub Date : 2022-04-01 DOI: 10.22201/ia.01851101p.2022.58.01.12
J. Liška, R. Hudec, Z. Mikulášek, M. Zejda, J. Janík, J. Štrobl
{"title":"CZEV502 – AN M DWARF NEAR THE LEO TRIPLET WITH VERY STRONG FLARES","authors":"J. Liška, R. Hudec, Z. Mikulášek, M. Zejda, J. Janík, J. Štrobl","doi":"10.22201/ia.01851101p.2022.58.01.12","DOIUrl":"https://doi.org/10.22201/ia.01851101p.2022.58.01.12","url":null,"abstract":"Discovery of flares in the M dwarf CzeV502 and our follow-up results are presented. We classify it as a dMe eruptive variable of UV Ceti type due to the X-ray activity, measured B − V of 1.5 mag, Hα; emission, and flares. Our monitoring revealed only one reliable and one suspected superflare in 58 nights (210 hrs). The strongest flare with ΔR = 1.5 mag (ΔB ≈ 6-8 mag) could have a total energy of 3E+34 erg. The ASAS-SN data may contain 4 events up to ΔV of 0.43 mag and 12.55 d periodicity corresponding to the rotation or possible binarity. Other brightenings in sky survey (ASAS-3, CRTS, NSVS, and KWS) are doubtful. No event was unveiled on the 1 600 photographic plates. The upper rate limit of 1-2 superflares/1 640 hrs corresponds to activity several orders higher than for other M-dwarfs, especially, for the slow rotators. The low amplitude flares ( ΔB < 0.5 mag) may be common (1 flare/4 hrs).","PeriodicalId":49602,"journal":{"name":"Revista Mexicana de Astronomia y Astrofisica","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44033863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
C,T1,T2: A COMPLEMENTARY METHOD TO DETECT MULTIPLE POPULATIONS WITH THE WASHINGTON FILTER SYSTEM C、 T1，T2：一种利用WASHINGTON滤波系统检测多种群的互补方法
IF 1 4区 物理与天体物理
Revista Mexicana de Astronomia y Astrofisica Pub Date : 2022-03-22 DOI: 10.22201/ia.01851101p.2022.58.02.02
H. Frelijj, D. Geisler, S. Villanova, C. Muñoz
{"title":"C,T1,T2: A COMPLEMENTARY METHOD TO DETECT MULTIPLE POPULATIONS WITH THE WASHINGTON FILTER SYSTEM","authors":"H. Frelijj, D. Geisler, S. Villanova, C. Muñoz","doi":"10.22201/ia.01851101p.2022.58.02.02","DOIUrl":"https://doi.org/10.22201/ia.01851101p.2022.58.02.02","url":null,"abstract":"The Planetary Society's LightSail-2 mission successfully validated the orbital maneuvering capability of a solar radiation pressure (SRP) propelled spacecraft. This paper presents a study on two alternative attitude strategies for the orientation of a solar sail. The goal is to increase the effect of the SRP acceleration over the spacecraft's orbital trajectory, with the intention of maintaining or even gaining altitude over time. Furthermore, one of these strategies was employed while varying a few of the mission's parameters to determine if it would be viable to maintain the spacecraft's average altitude. Results show that it is possible to increase the average altitude of the spacecraft over time while still reducing the number of maneuvers necessary to change the spacecraft's attitude. With that result in hand, it is also possible to change some of the mission parameters without compromising the solar sailing performance.","PeriodicalId":49602,"journal":{"name":"Revista Mexicana de Astronomia y Astrofisica","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43384337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A NEW VISIT TO THE VARIABLE STARS IN M56 AND ITS COLOUR-MAGNITUDE DIAGRAM STRUCTURE 对m56变星及其彩色星等图结构的新观测
IF 1 4区 物理与天体物理
Revista Mexicana de Astronomia y Astrofisica Pub Date : 2022-02-18 DOI: 10.22201/ia.01851101p.2022.58.01.10
D. Deras, A. Ferro, I. B. Fierro, M. A. Yepez
{"title":"A NEW VISIT TO THE VARIABLE STARS IN M56 AND ITS COLOUR-MAGNITUDE DIAGRAM STRUCTURE","authors":"D. Deras, A. Ferro, I. B. Fierro, M. A. Yepez","doi":"10.22201/ia.01851101p.2022.58.01.10","DOIUrl":"https://doi.org/10.22201/ia.01851101p.2022.58.01.10","url":null,"abstract":"We present a VI CCD photometric study and a membership analysis of the globular cluster M56 (NGC 6779). This produced a CMD decontaminated from field stars, which enabled a better confrontation with theoretical isochrones, zero-age horizontal branches (ZAHB) and post-ZAHB evolutionary tracks. Post He-flash evolutionary models with a He-core mass of 0.5 Mʘ and envelopes of 0.04 - 0.18 Mʘ, cover the complete horizontal branch. Models with total mass ≈ 0.68 Mʘ explain the RR Lyrae, while those with a mass ≈ 0.56 Mʘ and a very subtle envelope, explain the Pop II cepheids with a progenitor in the blue tail of the HB. Based on the Fourier decomposition of the V light curve of a single cluster member RRc star, we determined a metallicity of [Fe/H]ZW = −1.96 ± 0.09. Several independent distance determination approaches lead to a mean distance to M56 of ⟨d⟩ = 9.4 ± 0.4 kpc. Finally, we report 5 new variables: one SX Phe, three EB, and one Rrc.","PeriodicalId":49602,"journal":{"name":"Revista Mexicana de Astronomia y Astrofisica","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44993496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
COMPREHENSIVE ANALYSIS OF THE FULL TESS ORBITAL PHASE CURVE OF WASP121b wasp - 121b全TESS轨道相位曲线的综合分析
IF 1 4区 物理与天体物理
Revista Mexicana de Astronomia y Astrofisica Pub Date : 2022-02-07 DOI: 10.22201/ia.01851101p.2022.58.01.08
M. Eftekhar
{"title":"COMPREHENSIVE ANALYSIS OF THE FULL TESS ORBITAL PHASE CURVE OF WASP121b","authors":"M. Eftekhar","doi":"10.22201/ia.01851101p.2022.58.01.08","DOIUrl":"https://doi.org/10.22201/ia.01851101p.2022.58.01.08","url":null,"abstract":"We present the full phase curve analysis of the ultrahot Jupiter WASP-121b using observations from the Transiting Exoplanet Survey Satellite (TESS). Our comprehensive phase curve model includes primary transit, secondary eclipse, thermal emission, reflection, and ellipsoidal tidal distortion. After removing the instrumental systematic noise, we reliably detect the secondary eclipse with a depth of 489−10+16 parts-per-million (ppm), dominated by thermal emission. Using the TESS bandpass, we measure the dayside 2941−150+61K and nightside 2236−97+38K temperatures of WASP-121b. We find that a hotspot is well aligned with the substellar point, leading to the conclusion that there is an inefficient heat distribution from the dayside to the nightside. Our estimated geometric albedo, Ag = 0.069−0.02+0.06, suggest that WASP-121b has a low geometric albedo.","PeriodicalId":49602,"journal":{"name":"Revista Mexicana de Astronomia y Astrofisica","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2022-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44787683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
THE PROPERTIES OF HIGH REDSHIFT GALAXIES 高红移星系的性质
IF 1 4区 物理与天体物理
Revista Mexicana de Astronomia y Astrofisica Pub Date : 2021-12-21 DOI: 10.22201/ia.01851101p.2022.58.01.07
L. '. Garc'ia
{"title":"THE PROPERTIES OF HIGH REDSHIFT GALAXIES","authors":"L. '. Garc'ia","doi":"10.22201/ia.01851101p.2022.58.01.07","DOIUrl":"https://doi.org/10.22201/ia.01851101p.2022.58.01.07","url":null,"abstract":"This work studies the connection between the first galaxies and their hosting dark matter halos in the early Universe when reionization is concluding. Our numerical models (already presented in an earlier study) trace the star formation history at z = 4 - 8, the galaxy stellar mass function, the stellar-to-halo mass distribution, and other high redshift galaxies statistics. All these predictions are consistent with observations to date and with other high-resolution cosmological simulations. A key finding of this work is the robust estimate of the cosmic star formation history (through the implementation of galaxy and supernova winds and atomic and molecular cooling processes) and self-consistent chemical pollution of the intergalactic medium. The theoretical models are compatible with a faint-end slope of the galaxy luminosity function of α = −2 at the end of reionization.","PeriodicalId":49602,"journal":{"name":"Revista Mexicana de Astronomia y Astrofisica","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2021-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49016637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
TEMPERATURE DISCREPANCY WITH PHOTOIONIZATION MODELS OF THE NARROW-LINE REGION 窄带区光电离模型的温度差异
IF 1 4区 物理与天体物理
Revista Mexicana de Astronomia y Astrofisica Pub Date : 2021-12-17 DOI: 10.22201/ia.01851101p.2022.58.01.11
L. Binette, Montserrat Villar Mart'in, C. GladisMagris, Mariela Mart'inez-Paredes, A. Alarie, A. Ardila, I. Villicaña-Pedraza
{"title":"TEMPERATURE DISCREPANCY WITH PHOTOIONIZATION MODELS OF THE NARROW-LINE REGION","authors":"L. Binette, Montserrat Villar Mart'in, C. GladisMagris, Mariela Mart'inez-Paredes, A. Alarie, A. Ardila, I. Villicaña-Pedraza","doi":"10.22201/ia.01851101p.2022.58.01.11","DOIUrl":"https://doi.org/10.22201/ia.01851101p.2022.58.01.11","url":null,"abstract":"Using published work on the narrow-line region of Active Galactic Nuclei, a comparison is carried out among the [OIII] λ4363Å/5007Å ratios (ROIII) observed in quasars, Seyfert 2's and the spatially resolved ENLR plasma. Using the weak [ArIV] λ4711Å/λ4740Å doublet observed by Koski (1978) among Seyfert 2's, we find evidence of a Narrow-Line Region (NLR) populated by low density emission clouds (≲ 104 cm-3). After considering calculations of the [Ar] and [OIII] ratios that assume a powerlaw distribution of plasma densities, no evidence of collisional deexcitation is found. The plasma temperature that is inferred is 13 500 °K, which is problematic to reproduce with standard photoionization calculations. The simplest interpretation for the near coincidence of the ROIII ratios among the ENLR and Seyfert 2 measurements (ROIII ≃ 0.017) is that the low density regime applies to both plasmas.","PeriodicalId":49602,"journal":{"name":"Revista Mexicana de Astronomia y Astrofisica","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2021-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47438659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
A STUDY OF THE SX PHE STAR BL CAM SX-PHE星BL凸轮的研究
IF 1 4区 物理与天体物理
Revista Mexicana de Astronomia y Astrofisica Pub Date : 2021-10-01 DOI: 10.22201/ia.01851101p.2021.57.02.14
J. Pena, J. D. Paredes, D. S. Piña, H. Huepa, J. Guillén
{"title":"A STUDY OF THE SX PHE STAR BL CAM","authors":"J. Pena, J. D. Paredes, D. S. Piña, H. Huepa, J. Guillén","doi":"10.22201/ia.01851101p.2021.57.02.14","DOIUrl":"https://doi.org/10.22201/ia.01851101p.2021.57.02.14","url":null,"abstract":"We determined the physical parameters of the SX Phe star BL Cam from newly available times of maximum light and other times from the literature, as well as from uvby − β photoelectric photometry. From our analysis we found that this star is a binary system. The mass of the companion star was calculated in term of the mass of the primary star and the orbital angle. For this star we determined a metallicity [Fe/H] of −1.2 ± 0.3.","PeriodicalId":49602,"journal":{"name":"Revista Mexicana de Astronomia y Astrofisica","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45604259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
CHROMOSPHERIC ACTIVITY NATURE OF KIC 6044064 kic 6044064的色球活性性质
IF 1 4区 物理与天体物理
Revista Mexicana de Astronomia y Astrofisica Pub Date : 2021-10-01 DOI: 10.22201/ia.01851101p.2021.57.02.08
E. Yoldaş
{"title":"CHROMOSPHERIC ACTIVITY NATURE OF KIC 6044064","authors":"E. Yoldaş","doi":"10.22201/ia.01851101p.2021.57.02.08","DOIUrl":"https://doi.org/10.22201/ia.01851101p.2021.57.02.08","url":null,"abstract":"This study presents results obtained from the data of KIC 6044064 (KOI 6652). KIC 6044064 was observed by the Kepler Mission for a total of 1384.254 days. 525 minima times were determined, 264 of which were primary minima and the rest were secondary minima. The OPEA model was derived and its parameters were obtained. On the secondary component, there are two different spot bands latitudinally outstretched, consisting of three spots located with a phase interval of 0.33. The average migration period was found to be 623.063±4.870 days (1.71±0.01 years) for the first spot group, while it was 1125.514±7.305 days (3.08±0.02 years) for the second group. The spectral types of the components seem to be G7V+K9V. Their masses and radii were determined to be 0.86Mʘ and 0.89Rʘ for the primary component and 0.54Mʘ and 0.62Rʘ for the secondary component.","PeriodicalId":49602,"journal":{"name":"Revista Mexicana de Astronomia y Astrofisica","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43623876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
THE CHALLENGES OF MODELLING THE ACTIVITIES OCCURRING ON ECLIPSING BINARIES V1130 CYG AND V461 LYR 对食双星v1130cyg和v461lyr活动建模的挑战
IF 1 4区 物理与天体物理
Revista Mexicana de Astronomia y Astrofisica Pub Date : 2021-10-01 DOI: 10.22201/ia.01851101p.2021.57.02.07
E. Yoldaş, H. A. Dal
{"title":"THE CHALLENGES OF MODELLING THE ACTIVITIES OCCURRING ON ECLIPSING BINARIES V1130 CYG AND V461 LYR","authors":"E. Yoldaş, H. A. Dal","doi":"10.22201/ia.01851101p.2021.57.02.07","DOIUrl":"https://doi.org/10.22201/ia.01851101p.2021.57.02.07","url":null,"abstract":"We present the findings for the magnetic activities seen on V1130 Cyg and V461 Lyr. In the case of V1130 Cyg, the secondary component's temperature was found to be 3891±50 K, while the mass ratio was computed as 0.689±0.001, and the orbital inclination as 90°.00±0°.01. The temperature of V461 Lyr's secondary component was found to be 4206±50 K, and the mass ratio was calculated as 0.999±0.001 with 89°.58±0°.01 of orbital inclination. The analyses exhibit the effects of the stellar spots on the light curves. The models indicate that there are two types of flares in the case of V1130 Cyg, and three types of flares for V461 Lyr. The Plateau parameters have been found as 2.1997 s for Group 1 and 1.0068 s for Group 2 in the case of V1130 Lyr. They have been computed as 1.9015 s for Group 1, 2.7943 s for Group 2, and 3.4324 s for Group 3 of V461 Lyr.","PeriodicalId":49602,"journal":{"name":"Revista Mexicana de Astronomia y Astrofisica","volume":" ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42578299","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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