J/A+A/690/A176 B stars classification Northern standards (Negueruela+, 2024)
The IACOB project. XII. A new grid of Northern standards for the spectral
classification of B-type stars.
Negueruela I., Simon-Diaz S., de Burgos A., Casasbuenas A., Beck P.G.
<Astron. Astrophys. 690, A176 (2024)>
=2024A&A...690A.176N 2024A&A...690A.176N (SIMBAD/NED BibCode)
ADC_Keywords: Stars, B-type ; Stars, supergiant ; MK spectral classification
Keywords: surveys - binaries: general - stars: early-type - stars: evolution -
stars: fundamental parameters - supergiants
Abstract:
With the advent of large spectroscopic surveys, automated stellar
parameter determination has become commonplace. Nevertheless, spectral
classification still offers a quick and useful alternative for
obtaining parameter estimates for large samples of spectra of varying
quality. We present a new atlas of stellar spectra covering the B-type
range, with the intention of providing detailed classification
criteria valid for modern spectra and improving the grid of reliable
standards. This new grid will be used in future works to provide
classification criteria beyond the classical classification range and
addressing, in particular, the use of Gaia/RVS spectra. We analysed
historical standards by means of multiple high-resolution spectra,
marking out problematic cases and complementing the grid with a new
set of reliable comparators. We then elaborated on a new set of
classification criteria based on high-quality R=4000 spectra. Our new
classification grid is much thicker than any previous set of
standards, presenting a high degree of self-consistency. Although it
is based entirely on morphological criteria, the grid demonstrates a
much better correlation with different physical parameters. The new
grid can be used to study classification criteria in other spectral
ranges, providing a valuable tool for the study of B-type stars that
covers a very wide range of temperatures, luminosities, and stellar
masses. The very process of classification also offers valuable
insights into stellar evolution.
Description:
List of standard and reference stars, with their spectral type and
some basic information.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablef1.dat 55 159 List of standard and reference stars
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See also:
J/A+A/562/A135 : Northern Galactic OB stars vsini (Simon-Diaz+, 2014)
J/A+A/597/A22 : Massive O- and B-type stars velocities (Simon-Diaz+, 2017)
J/A+A/613/A65 : Spectroscopic parameters of O-type stars (Holgado+, 2018)
J/A+A/613/A9 : Extinction towards Galactic O stars (Maiz Apellaniz+, 2018)
J/A+A/638/A157 : O-type stars near ZAMS elusive detection (Holgado+, 2022)
J/A+A/665/A150 : Rotational properties of Galactic O-type stars (Holgado+ 2022)
J/A+A/672/A22 : Binarity in fast-rotating O-type stars (Britavskiy+, 2023)
J/A+A/674/A212 : Spectroscopic sample of Galactic O9-B9 SGs (de Burgos+, 2023)
Byte-by-byte Description of file: tablef1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name HD catalogue number (HDNNNNNN)
10- 22 A13 --- OName Other common names
24- 33 A10 --- SpType Spectral classification
35- 37 I3 km/s vsini Projected rotational velocity
39- 41 F3.1 mag Vmag Johnson V magnitude
43- 46 F4.1 mag VMAG Rough estimate of absolute magnitude
48- 51 F4.1 --- FW3414 Parameter to estimate line width for H-beta
53 I1 --- SB [0/2] Classification as spectroscopic binary
(0 is no indication of binarity)
55 I1 --- Profile [0/5] Type of H-beta profile, if fit not good
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Acknowledgements:
Ignacio Negueruela, ignacio.negueruela(at)ua.es
References:
Simon-Diaz & Herrero, Paper I 2014A&A...562A.135S 2014A&A...562A.135S, Cat. J/A+A/562/A135
Simon-Diaz et al., Paper II 2014A&A...570L...6S 2014A&A...570L...6S
Simon-Diaz et al., Paper III 2017A&A...597A..22S 2017A&A...597A..22S, Cat, J/A+A/597/A22
Godart et al., Paper IV 2017A&A...597A..23G 2017A&A...597A..23G
Holgado et al., Paper V 2018A&A...613A..65H 2018A&A...613A..65H, Cat. J/A+A/613/A65
Holgado et al., Paper VI 2020A&A...638A.157H 2020A&A...638A.157H, Cat. J/A+A/638/A157
Maiz-Apellaniz & Barba, 2018A&A...613A...9M 2018A&A...613A...9M, Cat. J/A+A/613/A9
Holgado et al., Paper VII 2022A&A...665A.150H 2022A&A...665A.150H, Cat. J/A+A/665/A150
Britavskiy et al., Paper VIII 2023A&A...672A..22B 2023A&A...672A..22B, Cat. J/A+A/672/A22
de Burgos et al., Paper IX 2023A&A...674A.212D 2023A&A...674A.212D, Cat. J/A+A/674/A212
(End) Patricia Vannier [CDS] 29-Jul-2024