A near-UV reconnaissance of metal-poor massive stars

IF 2.7 3区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Experimental Astronomy Pub Date : 2023-09-26 DOI:10.1007/s10686-023-09912-w

Chris Evans, Wagner Marcolino, Jean-Claude Bouret, Miriam Garcia

{"title":"A near-UV reconnaissance of metal-poor massive stars","authors":"Chris Evans, Wagner Marcolino, Jean-Claude Bouret, Miriam Garcia","doi":"10.1007/s10686-023-09912-w","DOIUrl":null,"url":null,"abstract":"<div>We use synthetic model spectra to investigate the potential of near-ultraviolet (3000-4050 Å) observations of massive O-type stars. We highlight the He I \\(\\lambda \\)3188 and He II \\(\\lambda \\)3203 pair as a potential temperature diagnostic in this range, supported by estimates of gravity using the high Balmer series lines. The near-ultraviolet also contains important metallic lines for determinations of chemical abundances (oxygen in particular) and estimates of projected rotational velocities for O-type spectra. Using the model spectra we present performance estimates for observations of extragalactic massive stars with the Cassegrain U-Band Efficient Spectrograph (CUBES) now in construction for the Very Large Telescope. The high efficiency of CUBES will open-up exciting new possibilities in the study of massive stars in external galaxies. For instance, CUBES will provide new insights into the physical properties of O-type stars, including oxygen abundances, in metal-poor irregular galaxies at \\(\\sim \\)1 Mpc from integrations of just 2-3 hrs. Moreover, CUBES will bring quantitative spectroscopy of more distant targets within reach for the first time, such as the O-type star (V \\(\\sim \\) 21.5 mag) in Leo P (at 1.6 Mpc) in only half a night of observations.</div>","PeriodicalId":551,"journal":{"name":"Experimental Astronomy","volume":"56 2-3","pages":"537 - 556"},"PeriodicalIF":2.7000,"publicationDate":"2023-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10686-023-09912-w.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Experimental Astronomy","FirstCategoryId":"101","ListUrlMain":"https://link.springer.com/article/10.1007/s10686-023-09912-w","RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ASTRONOMY & ASTROPHYSICS","Score":null,"Total":0}

引用次数: 0

Abstract

We use synthetic model spectra to investigate the potential of near-ultraviolet (3000-4050 Å) observations of massive O-type stars. We highlight the He I \(\lambda \)3188 and He II \(\lambda \)3203 pair as a potential temperature diagnostic in this range, supported by estimates of gravity using the high Balmer series lines. The near-ultraviolet also contains important metallic lines for determinations of chemical abundances (oxygen in particular) and estimates of projected rotational velocities for O-type spectra. Using the model spectra we present performance estimates for observations of extragalactic massive stars with the Cassegrain U-Band Efficient Spectrograph (CUBES) now in construction for the Very Large Telescope. The high efficiency of CUBES will open-up exciting new possibilities in the study of massive stars in external galaxies. For instance, CUBES will provide new insights into the physical properties of O-type stars, including oxygen abundances, in metal-poor irregular galaxies at \(\sim \)1 Mpc from integrations of just 2-3 hrs. Moreover, CUBES will bring quantitative spectroscopy of more distant targets within reach for the first time, such as the O-type star (V \(\sim \) 21.5 mag) in Leo P (at 1.6 Mpc) in only half a night of observations.

Abstract Image

查看原文本刊更多论文

贫金属大质量恒星的近紫外侦察

我们使用合成模型光谱来研究大质量O型星的近紫外（3000-4050 Å）观测潜力。我们强调He I （（lambda）3188和He II （（lambda）3203）线对是这一范围内潜在的温度诊断线，并利用高巴尔默系列线对重力的估算提供支持。近紫外光谱还包含重要的金属线，用于确定化学丰度（尤其是氧）和估计 O 型光谱的预计旋转速度。利用模型光谱，我们提出了使用正在为甚大望远镜建造的卡塞格伦 U 波段高效摄谱仪（CUBES）观测河外大质量恒星的性能估算。CUBES 的高效率将为研究河外星系中的大质量恒星提供令人兴奋的新可能性。例如，CUBES将提供对O型恒星物理性质的新见解，包括氧丰度，这些恒星位于（\sim \）1 Mpc的贫金属不规则星系中，其积分时间仅为2-3小时。此外，CUBES还将首次对更遥远的目标进行定量光谱分析，比如狮子座P（1.6 Mpc）中的O型星（V \(\sim \) 21.5 mag），只需要半个晚上的观测。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Experimental Astronomy 地学天文-天文与天体物理

CiteScore

5.30

自引率

3.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Many new instruments for observing astronomical objects at a variety of wavelengths have been and are continually being developed. Furthermore, a vast amount of effort is being put into the development of new techniques for data analysis in order to cope with great streams of data collected by these instruments. Experimental Astronomy acts as a medium for the publication of papers of contemporary scientific interest on astrophysical instrumentation and methods necessary for the conduct of astronomy at all wavelength fields. Experimental Astronomy publishes full-length articles, research letters and reviews on developments in detection techniques, instruments, and data analysis and image processing techniques. Occasional special issues are published, giving an in-depth presentation of the instrumentation and/or analysis connected with specific projects, such as satellite experiments or ground-based telescopes, or of specialized techniques.