Jump to ContentJump to Main Navigation
Show Summary Details
More options …

Open Astronomy

formerly Baltic Astronomy

Editor-in-Chief: Barbuy, Beatriz


IMPACT FACTOR 2018: 0.350

CiteScore 2018: 0.24

SCImago Journal Rank (SJR) 2018: 0.202
Source Normalized Impact per Paper (SNIP) 2018: 0.144

ICV 2017: 121.03

Open Access
Online
ISSN
2543-6376
See all formats and pricing
More options …
Volume 27, Issue 1

Issues

A FEROS Survey of Hot Subdwarf Stars

Stéphane Vennes / Péter Németh / Adela Kawka
Published Online: 2018-02-28 | DOI: https://doi.org/10.1515/astro-2018-0005

Abstract

We have completed a survey of twenty-two ultraviolet-selected hot subdwarfs using the Fiber-fed Extended Range Optical Spectrograph (FEROS) and the 2.2-m telescope at La Silla. The sample includes apparently single objects as well as hot subdwarfs paired with a bright, unresolved companion. The sample was extracted from our GALEX catalogue of hot subdwarf stars. We identified three new short-period systems (P = 3.5 hours to 5 days) and determined the orbital parameters of a long-period (P = 62d.66) sdO plus G III system. This particular system should evolve into a close double degenerate system following a second common envelope phase.We also conducted a chemical abundance study of the subdwarfs: Some objects show nitrogen and argon abundance excess with respect to oxygen. We present key results of this programme.

Keywords: binaries: close; binaries: spectroscopic; subdwarfs; white dwarfs; ultraviolet: stars

References

  • Barlow, B. N., Liss, S. E., Wade, R. A., & Green, E. M. 2013, ApJ, 771, 23.Google Scholar

  • Chen, X., Han, Z., Deca, J., & Podsiadlowski, P. 2013, MNRAS, 434, 186-193.Google Scholar

  • Copperwheat, C. M., Morales-Rueda, L., Marsh, T. R., Maxted, P. F. L., & Heber, U. 2011, MNRAS, 415, 1381-1395.Google Scholar

  • Deca, J., Vos, J., Németh, P., Maxted, P. F. L., Copperwheat, C. M., Marsh, T. R. et al. 2018, MNRAS, 474, 433-442.Google Scholar

  • Dorman, B., Rood, R. T., & O’Connell, R. W. 1993, ApJ, 419, 596-614.Google Scholar

  • Geier, S. 2013, A&A, 549, A110.Google Scholar

  • Geier, S., Hirsch, H., Tillich, A., Maxted, P. F. L., Bentley, S. J., Østensen, R. H. et al. 2011, A&A, 530, A28.Google Scholar

  • Han, Z., Podsiadlowski, P., Maxted, P. F. L., & Marsh, T. R. 2003, MNRAS, 341, 669-691.Google Scholar

  • Han, Z., Podsiadlowski, P., Maxted, P. F. L., Marsh, T. R., & Ivanova, N. 2002, MNRAS, 336, 449-466.Google Scholar

  • Hubeny, I. & Lanz, T. 1995, ApJ, 439, 875-904.Google Scholar

  • Hubeny, I. & Lanz, T. 2017, arXiv:1706.01859.Google Scholar

  • Jeffery, C. S., Baran, A. S., Behara, N. T., et al. 2017, MNRAS, 465, 3101-3124.Google Scholar

  • Kawka, A., Vennes, S., O’Toole, S., Németh, P., Burton, D., Kotze, E. et al. 2015, MNRAS, 450, 3514-3548.Google Scholar

  • Kupfer, T., Geier, S., Heber, U., Østensen, R., Barlow, B. N., Maxted, P. F. L. et al. 2015, A&A, 576, A44.Google Scholar

  • Lanz, T., & Hubeny, I. 1995, ApJ, 439, 905-916.Google Scholar

  • Mengel, J.G., Norris, J., & Gross, P.G. 1976, ApJ, 204, 488-492.Google Scholar

  • Maxted, P. F. L., Heber, U., Marsh, T. R., & North, R. C. 2001, MNRAS, 326, 1391-1402.Google Scholar

  • Maxted, P. F. L., Morales-Rueda, L., & Marsh, T. R. 2004, ApSS, 291, 307-314.Google Scholar

  • Morales-Rueda, L., Maxted, P. F. L., Marsh, T. R., North, R. C., & Heber, U. 2003, MNRAS, 338, 752-764.Google Scholar

  • Morrissey, P., Conrow, T., Barlow, T. A., Small, T., Seibert, M., Wyder, T. K. et al. 2007, ApJS, 173, 682-697.Google Scholar

  • Napiwotzki, R., Karl, C. A., Lisker, T., Heber, U., Christlieb, N., Reimers, D. et al. 2004, ApSS, 291, 321-328.Google Scholar

  • Németh, P., Kawka, A., & Vennes, S. 2012, MNRAS, 427, 2180-2211.Google Scholar

  • O’Donoghue, D., Kilkenny, D., Koen, C., Hambly, N., MacGillivray, H., & Stobie, R. S. 2013, MNRAS, 431, 240-251.Google Scholar

  • Pollacco, D. L., Skillen, I., Collier Cameron, A., Christian, D. J., Hellier, C., Irwin, J. et al. 2006, PASP, 118, 1407-1418.Google Scholar

  • Sweigart, A. V., Lanz, T., Brown, T. M., Hubeny, I., & Landsman, W. B. 2004, Ap&SS, 291, 367-370.Google Scholar

  • Unglaub, K. & Bues, I. 2001, A&A, 374, 570-583.Google Scholar

  • Vennes, S., Kawka, A., & Németh, P. 2011, MNRAS, 410, 2095-2112.Google Scholar

  • Vos, J., Németh, P., Vučković, M., Østensen, R., Parsons, S. 2018, MNRAS, 473, 693-709.Google Scholar

  • Vos, J., Østensen, R. H., Vučković, M., & Van Winckel, H. 2017, A&A 605, A109.Google Scholar

  • Webbink, R. F. 1984, ApJ, 277, 355-360.Google Scholar

  • Woźniak, P. R., Vestrand, W. T., Akerlof, C. W., et al. 2004, AJ, 127, 2436-2976.Google Scholar

About the article

Received: 2017-10-02

Accepted: 2017-11-07

Published Online: 2018-02-28


Citation Information: Open Astronomy, Volume 27, Issue 1, Pages 7–13, ISSN (Online) 2543-6376, DOI: https://doi.org/10.1515/astro-2018-0005.

Export Citation

© 2018, published by De Gruyter. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License. BY-NC-ND 4.0

Comments (0)

Please log in or register to comment.
Log in