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

Spectral analysis of the He-enriched sdO-star HD 127493

Matti Dorsch
  • Corresponding author
  • Dr. Karl Remeis-Observatory & ECAP, Astronomical Institute, Friedrich-Alexander University Erlangen-Nuremberg, Sternwartstr. 7, 96049 Bamberg, Germany
  • Email
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Marilyn Latour
  • Dr. Karl Remeis-Observatory & ECAP, Astronomical Institute, Friedrich-Alexander University Erlangen-Nuremberg, Sternwartstr. 7, 96049 Bamberg, Germany
  • Email
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Ulrich Heber
  • Dr. Karl Remeis-Observatory & ECAP, Astronomical Institute, Friedrich-Alexander University Erlangen- Nuremberg, Sternwartstr. 7, 96049 Bamberg, Germany
  • Email
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2018-02-28 | DOI: https://doi.org/10.1515/astro-2018-0007

Abstract

The bright sdO star HD127493 is known to be of mixed H/He composition and excellent archival spectra covering both optical and ultraviolet ranges are available. UV spectra play a key role as they give access to many chemical species that do not show spectral lines in the optical, such as iron and nickel. This encouraged the quantitative spectral analysis of this prototypical mixed H/He composition sdO star. We determined atmospheric parameters for HD127493 in addition to the abundance of C, N, O, Si, S, Fe, and Ni in the atmosphere using non-LTE model atmospheres calculated with TLUSTY/SYNSPEC. A comparison between the parallax distance measured by Hipparcos and the derived spectroscopic distance indicate that the derived atmospheric parameters are realistic. From our metal abundance analysis, we find a strong CNO signature and enrichment in iron and nickel.

Keywords: HD127493; hot subdwarf; atmospheric abundances

References

  • Asplund, M., Grevesse, N., Sauval, A. J., & Scott, P. 2009, Annual Review of A&A, 47, 481-522.Google Scholar

  • Bauer, F., & Husfeld, D. 1995, A&A, 300, 481-492.PubMedGoogle Scholar

  • Castellani, M., & Castellani, V. 1993, ApJ, 407, 649-656.Google Scholar

  • Fitzpatrick, E. L. 1999, PASP, 111, 63-75.Google Scholar

  • Fontaine, G., Green, E., Brassard, P., Latour, M., & Chayer, P. 2014, in PASP In: V. van Grootel, E. Green, G. Fontaine, & S. Charpinet (Eds.), Conference Series 6th Meeting on Hot Subdwarf Stars and Related Objects, 481, 83-86.Google Scholar

  • Gourgouliatos, K. N., & Jeffery, C. S. 2006, MNRAS, 371, 1381-1389.Google Scholar

  • Heber, U. 2016, PASP, 128, 082001.Google Scholar

  • Hirsch, H. A. 2009, PhD thesis, FAU Erlangen-Nürnberg, Germany.Google Scholar

  • Hubeny, I. 1988, Computer Physics Communications, 52, 103-132.CrossrefGoogle Scholar

  • Hubeny, I., & Lanz, T. 2017a, ArXiv e-prints, arXiv:1706.01859Google Scholar

  • Hubeny, I., & Lanz, T. 2017b, ArXiv e-prints, arXiv:1706.01935Google Scholar

  • Hubeny, I., & Lanz, T. 2017c, ArXiv e-prints, arXiv:1706.01937Google Scholar

  • Kaufer, A., Stahl, O., Tubbesing, S., et al. 1999, The Messenger, 95, 8-12.Google Scholar

  • Lanz, T., Hubeny, I., & Heap, S. R. 1997, ApJ, 485, 843-858.Google Scholar

  • Miller Bertolami, M. M., Althaus, L. G., Unglaub, K., & Weiss, A. 2008, A&A, 491, 253-265.Google Scholar

  • Münch, G., & Greenstein, J. L. 1955, In: D. R. Swift (Ed.), Carnegie Institution Year Books, Vol. 54, 11.Google Scholar

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

  • Schlafly, E. F., & Finkbeiner, D. P. 2011, ApJ, 737, 103.Google Scholar

  • Scott, P., Asplund, M., Grevesse, N., Bergemann, M., & Sauval, A. J. 2015a, A&A, 573, A26.Google Scholar

  • Scott, P., Grevesse, N., Asplund, M., et al. 2015b, A&A, 573, A25.Google Scholar

  • Simon, K. P. 1982, A&A, 107, 313-319.Google Scholar

  • van Leeuwen, F. 2007, A&A, 474, 653-664.Google Scholar

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

  • Werner, K., Deetjen, J. L., Dreizler, S., et al. 2003, In: I. Hubeny, D. Mihalas, & K. Werner (Eds.), PASP Conference Series, Stellar Atmosphere Modeling (8-12 April 2002, Tuebingen, Germany), 288, 31-50.Google Scholar

  • Werner, K., & Dreizler, S. 1999, Journal of Computational and Applied Mathematics, 109, 65-93.CrossrefGoogle Scholar

  • Zhang, X., & Jeffery, C. S. 2012, MNRAS, 419, 452-465.Google Scholar

About the article

Received: 2017-10-09

Accepted: 2017-11-21

Published Online: 2018-02-28


Citation Information: Open Astronomy, Volume 27, Issue 1, Pages 19–26, ISSN (Online) 2543-6376, DOI: https://doi.org/10.1515/astro-2018-0007.

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