J/A+A/674/A212 Spectroscopic sample of Galactic O9-B9 SGs (de Burgos+, 2023)
The IACOB project IX.
Building a modern empirical database of Galactic O9 - B9 supergiants:
Sample selection, description, and completeness.
de Burgos A., Simon-Diaz S., Urbaneja M.A., Negueruela, I.
<Astron. Astrophys. 674, A212 (2023)>
=2023A&A...674A.212D 2023A&A...674A.212D (SIMBAD/NED BibCode)
ADC_Keywords: Stars, OB ; Spectroscopy ; Rotational velocities ;
Stars, distances ; Optical
Keywords: stars: massive, supergiants - stars: rotation - stars: distances -
techniques: spectroscopic - techniques: photometric
Abstract:
Blue supergiants (BSGs) are key objects to study the intermediate
phases of massive star evolution, helping to constrain evolutionary
models. However, the lack of a holistic study of a statistically
significant and unbiased sample of these objects makes several
long-standing questions about their physical properties and
evolutionary nature remain unsolved. The present and other upcoming
papers of the IACOB series are focused in studying - from a pure
empirical point of view - a sample of about 500 Galactic O9-B9 stars
with luminosity classes I and II (plus 250 late O- and early B-type
stars with luminosity classes III, IV and V) and covering distances up
to ∼4kpc from the Sun. We compile an initial set of ∼11000
high-resolution spectra from ∼1600 Galactic late O- and B-type stars.
We use a novel spectroscopic strategy based on a simple fitting of the
Hβ line to select stars in a specific region of the spectroscopic
HR diagram. We evaluate the completeness of our sample using the Alma
Luminous Star catalog (ALS III) and Gaia-DR3 data. We show the
benefits of the proposed strategy for identifying BSGs descending, in
the context of single star evolution, from stellar objects born as
O-type stars. The resulting sample reaches a high level of
completeness with respect to the ALS III catalog, gathering ∼80% of
all-sky targets brighter than Bmag<9 located within 2kpc. However, we
identify the need for new observations in specific regions of the
Southern hemisphere. We have explored a very fast and robust method to
select BSGs, providing a valuable tool for large spectroscopic surveys
as WEAVE-SCIP or 4MIDABLE-LR, and highlighting the risk of using
spectral classifications from the literature. Upcoming studies will
make use of this large and homogeneous spectroscopic sample to study
specific properties of these stars in detail. We initially provide
first results about their rotational properties (in terms of projected
rotational velocities, vsini)
Description:
List of stars in the sample of Galactic O9-B9 supergiants:
Identificator, visual B magnitude, spectral classification from
Simbad, reference spectrum, S/N ratio, FW3414(Hb) value, SB2
identification, Hα and Hβ morphology and projected rotational
velocity (vsini). For the stars with photometric and kinematic data
from Gaia DR3: galactic l and b coordinates, magnitudes G, BP and RP,
parallax, proper motion, RUWE value and distance from Bailer-Jones et
al. (2021AJ....161..147B 2021AJ....161..147B, Cat. I/352. For the remaining stars with
photometric and kinematic data from Hipparcos: galactic l and b
coordinates, magnitude B-V, parallax, proper motion and distance.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tableh1.dat 120 733 Relevant information for the sample of stars
tableh2.dat 109 716 Photometric and kinematic data from Gaia DR3
tableh3.dat 66 17 Photometric and kinematic data from Hipparcos
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See also:
I/352 : Distances to 1.47 billion stars in Gaia EDR3
(Bailer-Jones+, 2021)
J/A+A/643/A116 : HR study of massive supergiants in Per OB1 (de Burgos+, 2020)
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)
Byte-by-byte Description of file: tableh1.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name Identificator of the star,
ordered by Galactic longitude
13 A1 --- n_Name [*] Note on Name (1)
15- 19 F5.2 mag Bmag Apparent B magnitude (Simbad)
21- 27 A7 --- SpT Spectral type of the star (Simbad) (2)
29- 39 A11 --- LC Luminosity class of the star (Simbad) (2)
41- 78 A38 --- RefSp Fits file-name of the best spectrum
80- 82 I3 --- S/N Signal-to-noise ratio in 4000-5000Å
84- 86 F3.1 0.1nm FW3414Hb ? Hbeta width difference at 3/4-1/4 depths (3)
88- 95 A8 --- SB2+ Identifier of spectroscopic binary (4)
97-105 A9 --- Halpha Morphological classification of Hα
107-116 A10 --- Hbeta Morphological classification of Hβ
118-120 I3 km/s vsini Projected rotational velocity
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Note (1): Notes for individual stars:
HD202850, HD12301, HD46847, HD303143: B-type stars wrongly classified as
A-type in the default Simbad classification and included in this work.
HD13970: the classification has been taken from de Burgos et al.,
2020A&A...643A.116D 2020A&A...643A.116D, Cat. J/A+A/643/A116
HD164816, HD168021, HD168183, HD191201A, HD187879, HDE228989, HD209481,
HD1337, HD16429, HD17520A, HD24431, HD75759, HD115071, HD152218, HD147165:
Stars for which the default Simbad classification includes SpT and LC for a
second component but we have only listed the first.
Note (2): Stars for which the SpT and LC are in parenthesis have their spectral
classifications reviewed (see Appendix D: New spectral classifications).
Note (3): We adopt a global uncertainty for FW3414Hb of 0.1Å.
Note (4): Stars with * in the column SB2+ are new spectroscopic identifications.
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Byte-by-byte Description of file: tableh2.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name Identificator of the star,
ordered by Galactic longitude
13- 20 F8.4 deg GLON Galactic longitude
22- 29 F8.4 deg GLAT Galactic latitude
31- 35 F5.2 mag Gmag G magnitude from Gaia DR3
37- 41 F5.2 mag BPmag ? BP magnitude from Gaia DR3
43- 47 F5.2 mag RPmag ? RP magnitude from Gaia DR3
49- 53 F5.3 mas plx ? Parallax from Gaia DR3 (1)
55- 59 F5.3 mas e_plx ? Uncertainty on plx
61- 67 F7.3 mas/yr pmRA Proper motion along RA (pmRA*cosDE)
69- 73 F5.3 mas/yr e_pmRA Uncertainty on pmRA
75- 81 F7.3 mas/yr pmDE Proper motion along DE
83- 87 F5.3 mas/yr e_pmDE Uncertainty on pmDE
89- 93 F5.2 --- RUWE Renormalised unit weight error
95- 98 I4 pc Dist Geometric distance from
Bailer-Jones et al. (2021, Cat. I/352)
100-103 I4 pc b_Dist Lower value of Dist
105-109 I5 pc B_Dist Upper value of Dist
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Note (1): Parallaxes are corrected from zero-point offset.
Negative parallaxes have been masked.
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Byte-by-byte Description of file: tableh3.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Identificator of the star
11- 18 F8.4 deg GLON Galactic longitude
20- 27 F8.4 deg GLAT Galactic latitude
29- 34 F6.3 mag B-V B-V magnitude from Hipparcos
36- 40 F5.2 mas plx ? Parallax from Hipparcos (1)
42- 45 F4.2 mas e_plx ? Uncertainty on plx
47- 52 F6.2 mas/yr pmRA Proper motion along RA (pmRA*cosDE)
54- 59 F6.2 mas/yr pmDE Proper motion along DE
61- 63 I3 pc Dist ? Distance the inverse of the parallax (2)
65- 66 I2 pc e_Dist ? Uncertainty on Dist
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Note (1): HD51756 has a negative parallax and therefore the value and the
corresponding distance are not included in the table.
Note (2): Distances for stars with e_plx/plx>0.1 are not included.
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Acknowledgements:
Abel de Burgos, astroabelink(at)gmail.com
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
(End) Abel de Burgos [ULL,IAC], Patricia Vannier [CDS] 05-May-2023