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A Spectroscopic Search for New Sdb Stars from the Galex Survey

Rhee, J. and Seibert, M. and Østensen, R. H. and Yi, S. K. and Rey, S.-C. and Rich, R. M. and Bianchi, L. and Lee, Y.-W. (2006) A Spectroscopic Search for New Sdb Stars from the Galex Survey. Baltic Astronomy, 15 (1). pp. 77-80. ISSN 1392-0049.

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We have recently initiated a systematic search for the UV-bright, subdwarf B (sdB) stars in the Milky Way. The sdB stars are core He-burning stars with very thin H envelopes and are known to be immediate progenitors of white dwarfs, but their formation mechanism is still enigmatic. For instance, it is not clear whether such objects are born as single stars or can form only in binary systems. The number ratio of sdB stars in each Galactic stellar population (i.e., thin disk, thick disk and halo) may give a clue to which of the suggested formation mechanisms dominates: the binary scenario or the RGB-peel-off scheme. This approach was hampered by the lack of identified sdB stars belonging to the thin disk and halo. Thus, it is of primary importance to find new sdB stars that are faint (halo) and lie at lower Galactic latitudes (thin disk). In this contribution, we will describe the motivation and plan for our spectroscopic survey and preliminary results based on pilot observations for 34 sdB star candidates from the GALEX All-sky Imaging Survey.

Item Type:Article
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URLURL TypeDescription
Seibert, M.0000-0002-1143-5515
Rich, R. M.0000-0003-0427-8387
Additional Information:© 2006 Teorines Fizikos ir Astronomijos Institutas. Provided by the NASA Astrophysics Data System. Received 2005 August 1. We are grateful to the referee, Sabine Moehler, for her careful review of the paper and a number of thoughtful suggestions. We gratefully acknowledge support for this work from NASA grant GALEX GI 04-0000-0096. J. R. and Y.-W. L. appreciate partial support by the Korean Ministry of Science and Technology through the Creative Research Initiative Program.
Funding AgencyGrant Number
NASA GALEXGI 04-0000-0096
Korean Ministry of Education, Science and TechnologyUNSPECIFIED
Subject Keywords:stars: early-type, stars: subdwarfs, surveys
Issue or Number:1
Record Number:CaltechAUTHORS:20110729-082514707
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Official Citation:J.Rhee, M. Seibert, R. H. Âstensen, S. K. Yi, S.-C.Rey, R. M.Rich, L. Bianchi, Y.-W. Lee. A spectroscopic search for new sdB stars from the GALEX survey pp 77-80
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:24593
Deposited By: Ruth Sustaita
Deposited On:29 Jul 2011 17:46
Last Modified:09 Mar 2020 13:19

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