Photometric Stromgren-H beta Quantification for O and B Stars of Luminosity Class V

KALTCHEVA, Nadia, Valeri GOLEV and Ernst PAUNZEN. Photometric Stromgren-H beta Quantification for O and B Stars of Luminosity Class V. Publications of the Astronomical Society of the Pacific. Bristol: IOP PUBLISHING LTD, 2017, vol. 129, No 981, p. 114201-114210. ISSN 0004-6280. Available from: https://dx.doi.org/10.1088/1538-3873/aa8cbd.

Basic information

• Original name: Photometric Stromgren-H beta Quantification for O and B Stars of Luminosity Class V
• Authors: KALTCHEVA, Nadia (840 United States of America), Valeri GOLEV (100 Bulgaria) and Ernst PAUNZEN (40 Austria, guarantor, belonging to the institution).
• Edition: Publications of the Astronomical Society of the Pacific, Bristol, IOP PUBLISHING LTD, 2017, 0004-6280.

Other information

• Original language: English
• Type of outcome: Article in a journal
• Field of Study: 10308 Astronomy
• Country of publisher: United Kingdom of Great Britain and Northern Ireland
• Confidentiality degree: is not subject to a state or trade secret
• Impact factor: Impact factor: 3.409
• RIV identification code: RIV/00216224:14310/17:00099901
• Organization unit: Faculty of Science
• Doi: http://dx.doi.org/10.1088/1538-3873/aa8cbd
• UT WoS: 000412416800001
• Keywords in English: stars: early-type; techniques: photometric; stars: fundamental parameters
• Tags: NZ, rivok
• Tags: International impact, Reviewed

Abstract

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 Stromgren-H beta photometry to provide reddening-free quantities allows the classification of reddened stars over the entire spectral sequence. However, a detailed consistent tabulation of the uvby beta 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 c(1), m(1), [c(1)] and [m(1)] and the H beta 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 c(1) 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.