Observations of binary stars with the differential speckle survey instrument. V. Toward an empirical metal-poor mass-luminosity relation

Horch, Elliott P. and Van Altena, William F. and Demarque, Pierre and Howell, Steve B. and Everett, Mark E. and Ciardi, David R. and Teske, Johanna K. and Henry, Todd J. and Winters, Jennifer G. (2015) Observations of binary stars with the differential speckle survey instrument. V. Toward an empirical metal-poor mass-luminosity relation. The Astronomical Journal, 149 (5). pp. 151-164. ISSN 0004-6256

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Abstract

In an effort to better understand the details of the stellar structure and evolution of metal-poor stars, the Gemini North telescope was used on two occasions to take speckle imaging data of a sample of known spectroscopic binary stars and other nearby stars in order to search for and resolve close companions. The observations were obtained using the Differential Speckle Survey Instrument, which takes data in two filters simultaneously. The results presented here are of 90 observations of 23 systems in which one or more companions was detected, and six stars where no companion was detected to the limit of the camera capabilities at Gemini. In the case of the binary and multiple stars, these results are then further analyzed to make first orbit determinations in five cases, and orbit refinements in four other cases. The mass information is derived, and since the systems span a range in metallicity, a study is presented that compares our results with the expected trend in total mass as derived from the most recent Yale isochrones as a function of metal abundance. These data suggest that metal-poor main-sequence stars are less massive at a given color than their solar-metallicity analogues in a manner consistent with that predicted from the theory.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Access to published version in accordance with the copyright policy of the publisher.
Faculty / Department / School: No Faculty
Date Deposited: 31 May 2017 07:34
Last Modified: 30 Oct 2017 01:28
Uncontrolled Keywords: astrometry; binaries: visualtechniques: high angular resolution; techniques: interferometric techniques: photometric;
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
02 Physical Sciences > 0201 Astronomical and Space Sciences > 020102 Astronomical and Space Instrumentation
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.1088/0004-6256/149/5/151
URI: http://eprints.usq.edu.au/id/eprint/32107

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