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

J 2017

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

KALTCHEVA, Nadia; Valeri GOLEV and Ernst PAUNZEN

Basic information

Original name

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

Authors

KALTCHEVA, Nadia; Valeri GOLEV and Ernst PAUNZEN

Edition

Publications of the Astronomical Society of the Pacific, Bristol, IOP PUBLISHING LTD, 2017, 0004-6280

Other information

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

https://doi.org/10.1088/1538-3873/aa8cbd

UT WoS

000412416800001

Keywords in English

stars: early-type; techniques: photometric; stars: fundamental parameters

Abstract

In the original language

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.

Cite

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://doi.org/10.1088/1538-3873/aa8cbd.

@article{1406903,
   author = {Kaltcheva, Nadia and Golev, Valeri and Paunzen, Ernst},
   article_location = {Bristol},
   article_number = {981},
   doi = {https://doi.org/10.1088/1538-3873/aa8cbd},
   keywords = {stars: early-type; techniques: photometric; stars: fundamental parameters},
   language = {eng},
   issn = {0004-6280},
   journal = {Publications of the Astronomical Society of the Pacific},
   title = {Photometric Stromgren-H beta Quantification for O and B Stars of Luminosity Class V},
   volume = {129},
   year = {2017}
}

TY  - JOUR
ID  - 1406903
AU  - Kaltcheva, Nadia - Golev, Valeri - Paunzen, Ernst
PY  - 2017
TI  - Photometric Stromgren-H beta Quantification for O and B Stars of Luminosity Class V
JF  - Publications of the Astronomical Society of the Pacific
VL  - 129
IS  - 981
SP  - 114201-114210
EP  - 114201-114210
PB  - IOP PUBLISHING LTD
SN  - 00046280
KW  - stars: early-type
KW  - techniques: photometric
KW  - stars: fundamental parameters
N2  - 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.
ER  -

KALTCHEVA, Nadia; Valeri GOLEV and Ernst PAUNZEN. Photometric Stromgren-H beta Quantification for O and B Stars of Luminosity Class V. \textit{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://doi.org/10.1088/1538-3873/aa8cbd.

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