{"title":"New M-type Periodic Variables of Catalina Sky Survey Database","authors":"G. R. Kostandyan","doi":"10.1007/s10511-026-09901-9","DOIUrl":null,"url":null,"abstract":"<p>In this paper we continue spectral class determinations for optically faint periodic variables from Catalina Sky Survey (CSS) database for which P ≥ 10 days. Based on Gaia Data Release 3 (DR3) BP/RP spectroscopic data base 169 objects are confirmed as G and K-type stars, 78 objects are confirmed as M-type stars. We have constructed the color-absolute M(G) magnitude (CaMD) diagram and 2MASS data J-H versus H-Ks color-color diagram for new 78 M type stars. By analyzing the two diagrams and Transiting Exoplanet Survey Satellite (TESS) data, we can conclude that 74 objects are M giants and 4 objects are M dwarfs. The ASAS-SN phase dependence light curves analysis confirms 47 stars as Mira-type variables, 25 as Semi-Regulars (SR), two objects as Irregular (IR)-type variables and 4 as Rotating variables (ROT). Two M type dwarfs and 34 giants, show Spectral Energy Distribution (SED) with infrared excess, indicating the existence of circumstellar envelope around them.</p>","PeriodicalId":479,"journal":{"name":"Astrophysics","volume":"68 4","pages":"571 - 582"},"PeriodicalIF":0.9000,"publicationDate":"2026-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Astrophysics","FirstCategoryId":"101","ListUrlMain":"https://link.springer.com/article/10.1007/s10511-026-09901-9","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"ASTRONOMY & ASTROPHYSICS","Score":null,"Total":0}
引用次数: 0
Abstract
In this paper we continue spectral class determinations for optically faint periodic variables from Catalina Sky Survey (CSS) database for which P ≥ 10 days. Based on Gaia Data Release 3 (DR3) BP/RP spectroscopic data base 169 objects are confirmed as G and K-type stars, 78 objects are confirmed as M-type stars. We have constructed the color-absolute M(G) magnitude (CaMD) diagram and 2MASS data J-H versus H-Ks color-color diagram for new 78 M type stars. By analyzing the two diagrams and Transiting Exoplanet Survey Satellite (TESS) data, we can conclude that 74 objects are M giants and 4 objects are M dwarfs. The ASAS-SN phase dependence light curves analysis confirms 47 stars as Mira-type variables, 25 as Semi-Regulars (SR), two objects as Irregular (IR)-type variables and 4 as Rotating variables (ROT). Two M type dwarfs and 34 giants, show Spectral Energy Distribution (SED) with infrared excess, indicating the existence of circumstellar envelope around them.
期刊介绍：
Astrophysics (Ap) is a peer-reviewed scientific journal which publishes research in theoretical and observational astrophysics. Founded by V.A.Ambartsumian in 1965 Astrophysics is one of the international astronomy journals. The journal covers space astrophysics, stellar and galactic evolution, solar physics, stellar and planetary atmospheres, interstellar matter. Additional subjects include chemical composition and internal structure of stars, quasars and pulsars, developments in modern cosmology and radiative transfer.
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