Skip to main content
SpringerLink
Log in

Abundance analyses of three helium-rich sdB stars

  • Original Article
  • Published:
Astrophysics and Space Science Aims and scope Submit manuscript

Abstract

As part of an extended study of the surface abundances of extremely helium-rich hot subdwarfs, high-resolution optical échelle spectra of the three helium-rich subdwarf B stars LB 1766, SB 21 and BPS 22940–0009 are presented. Opacity-sampled line-blanketed model atmospheres have been used to derive atmospheric properties and surface abundances. All three stars are moderately metal-poor compared with the Sun ([Fe/H]≈−0.4). The first two stars are nitrogen-rich He-sdBs, while the third is a carbon-rich He-sdB. The surface composition and locus of single N-rich He-sdBs are currently best explained by the merger of two helium white dwarfs. C-rich He-sdBs require further investigation.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  • Ahmad, A., Jeffery, C.S.: Astron. Astrophys. 402, 335 (2003)

    Article  ADS  Google Scholar 

  • Ahmad, A., Jeffery, C.S.: Astrophys. Space Sci. 291, 253 (2004)

    Article  ADS  Google Scholar 

  • Ahmad, A., Jeffery, C.S.: Baltic Astron. 15, 139 (2006)

    ADS  Google Scholar 

  • Ahmad, A., Jeffery, C.S., Fullerton, A.W.: Astron. Astrophys. 418, 275 (2004)

    Article  ADS  Google Scholar 

  • Ahmad, A., Behara, N.T., Jeffery, C.S., Sahin, T., Woolf, V.M.: Astron. Astrophys. 465, 541 (2007)

    Article  ADS  Google Scholar 

  • Beers, T.C., Doinidis, S.P., Griffin, K.E., Preston, G.W., Shectman, S.A.: Astron. J. 103, 267 (1992)

    Article  ADS  Google Scholar 

  • Behara, N.T., Jeffery, C.S.: Astron. Astrophys. 451, 643 (2006)

    Article  ADS  Google Scholar 

  • Brown, T.M., Sweigart, A.V., Lanz, T., Landsman, W.B., Hubeny, I.: Astrophys. J. 562, 368 (2001)

    Article  ADS  Google Scholar 

  • Drilling, J.S., Jeffery, C.S., Heber, U.: Astron. Astrophys. 329, 1019 (1998)

    ADS  Google Scholar 

  • Drilling, J.S., Moehler, S., Jeffery, C.S., Heber, U., Napiwotzki, R.: In: Gray, R.O., Corbally, C.J., Philip, A.G.D. (eds.) The Garrison Festschrift, p. 27 (2003)

  • Geir, S., Heber, U., Tillich, A., Hirsch, H., Edelmann, H., Schaffenroth, V., Kupfer, T., Müller, S., Maxted, T.F.L., Østensen, R., Podsiadlowski, P., Marsh, T., Gänsicke, B., Morales-Rueda, L., Nelemans, G., Napiwotzki, R., Günther, E.W., Carone, L.: Astrophys. Space Sci. (2010) this volume

  • Green, R.F., Schmidt, M., Liebert, J.: Astrophys. J. Suppl. Ser. 61, 305 (1986)

    Article  ADS  Google Scholar 

  • Grevesse, N., Sauval, A.J.: Space Sci. Rev. 85, 161 (1998)

    Article  ADS  Google Scholar 

  • Heber, U.: Astron. Astrophys. 155, 33 (1986)

    ADS  Google Scholar 

  • Heber, U.: Annu. Rev. Astron. Astrophys. 47, 211 (2009)

    Article  ADS  Google Scholar 

  • Hunger, K., Kudritzki, R.P.: Astron. Astrophys. 88, 4 (1980)

    ADS  Google Scholar 

  • Hunger, K., Gruschinske, J., Kudritzki, R.P., Simon, K.P.: Astron. Astrophys. 95, 244 (1981)

    ADS  Google Scholar 

  • Jeffery, C.S.: In: Jeffery, C.S., Heber, U. (eds.) Hydrogen Deficient Stars. Astronomical Society of the Pacific Conference Series, vol. 96, p. 152 (1996)

  • Jeffery, C.S., Hill, P.W., Heber, U.: Astron. Astrophys. 346, 491 (1999)

    ADS  Google Scholar 

  • Jeffery, C.S., Woolf, V.M., Pollacco, D.L.: Astron. Astrophys. 376, 497 (2001)

    Article  ADS  Google Scholar 

  • Justham, S., Podsiadlowski, P., Han, Z., Wolf, C.: Astrophys. Space Sci. (2010) this volume

  • Lanz, T., Brown, T.M., Sweigart, A.V., Hubeny, I., Landsman, W.B.: Astrophys. J. 602, 342 (2004)

    Article  ADS  Google Scholar 

  • Lisker, T., Heber, U., Napiwotzki, R., Christlieb, N., Reimers, D., Homeier, D.: Astrophys. Space Sci. 291, 351 (2004)

    Article  ADS  Google Scholar 

  • Miller Bertolami, M.M., Althaus, L.G., Unglaub, K., Weiss, A.: Astron. Astrophys. 491, 253 (2008)

    Article  ADS  Google Scholar 

  • Mills, D., Webb, J., Clayton, W.: Starlink User Note 152 (2006)

  • Moehler, S., Richtler, T., de Boer, K.S., Dettmar, R.J., Heber, U.: Astron. Astrophys. Suppl. Ser. 86, 53 (1990)

    ADS  Google Scholar 

  • Napiwotzki, R.: In: Werner, A., Rauch, T. (eds.) Hydrogen-deficient Stars. Astronomical Society of the Pacific Conference Series, vol. 391, p. 257 (2008)

  • Pandey, G., Lambert, D.L., Jeffery, C.S., Rao, N.K.: Astrophys. J. 638, 454 (2006)

    Article  ADS  Google Scholar 

  • Saio, H., Jeffery, C.S.: Mon. Not. R. Astron. Soc. 313, 671 (2000)

    Article  ADS  Google Scholar 

  • Şahìn, T.: An observational study of post-asymptotic giant branch stars. Ph.D. thesis, Queens University Belfast (2008)

  • Stroeer, A., Heber, U., Lisker, T., Napiwotzki, R., Dreizler, S., Christlieb, N., Reimers, D.: Astron. Astrophys. 462, 269 (2007)

    Article  ADS  Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Armagh Observatory, College Hill, Armagh, BT61 9DG, N. Ireland, UK

    Naslim N., C. S. Jeffery, A. Ahmad, N. Behara & T. Şahìn

  2. l’Institut d’Astronomie et d’Astrophysique, l’Université Libre de Bruxelles, Brussels, Belgium

    N. Behara

  3. Department of Astronomy and The W.J. McDonald Observatory, The University of Texas at Austin, Austin, TX, 78712, USA

    T. Şahìn

Authors
  1. Naslim N.
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. C. S. Jeffery
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. A. Ahmad
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. N. Behara
    View author publications

    You can also search for this author in PubMed Google Scholar

  5. T. Şahìn
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to Naslim N..

Rights and permissions

Reprints and permissions

About this article

Cite this article

N., N., Jeffery, C.S., Ahmad, A. et al. Abundance analyses of three helium-rich sdB stars. Astrophys Space Sci 329, 119–125 (2010). https://doi.org/10.1007/s10509-010-0334-x

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s10509-010-0334-x

Keywords

Search

Navigation