Photometric Strömgren-Hβ Quantification for O and B Stars of Luminosity Class V
- Autor(en)
- Nadia Kaltcheva, Valeri Golev, Ernst Paunzen
- Abstrakt
In any photometric system, the relationship between the spectral type and the intrinsic colors is fundamental for the photometric stellar classification and for a reliable derivation of stellar parameters. Such relationships are being constantly verified and improved based on larger and better samples. The capability of the Strömgren-Hβ photometry to provide reddening-free quantities allows the classification of reddened stars over the entire spectral sequence. However, a detailed consistent tabulation of the uvbyβ quantities for the O-B9 part of the main sequence is currently warranted. We combine spectral types and photometry from the literature to provide a new empirical tabulation of the intrinsic color b - y, color differences c1, m1, [c1] and [m1] and the Hβ index for main-sequence (luminosity class V) stars of spectral types O4.5 through B9.5 in terms of spectral sub-types. Our survey is based on more than 1400 stars. We use the established c1 versus b - y intrinsic line and the accepted reddening slopes to obtain dereddened quantities and then calculate their median values as a function of the spectral sub-type. The classification ability of the system in this spectral range is reliable and the photometric quantities are not affected by the stellar rotation.
- Organisation(en)
- Institut für Astrophysik
- Externe Organisation(en)
- University of Wisconsin, Oshkosh, Sofia University "St. Kliment Ohridski", Masaryk University
- Journal
- Publications of the Astronomical Society of the Pacific
- Band
- 129
- Anzahl der Seiten
- 10
- ISSN
- 0004-6280
- DOI
- https://doi.org/10.1088/1538-3873/aa8cbd
- Publikationsdatum
- 11-2017
- Peer-reviewed
- Ja
- ÖFOS 2012
- 103003 Astronomie, 103004 Astrophysik
- Schlagwörter
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/f315e1df-f93e-44a7-bd31-2a454b1d986b