J/AJ/155/190 Carina Nebula hot stars: stellar parameters and RVs (Hanes+, 2018)
Stellar parameters and radial velocities of hot stars in the Carina Nebula.
Hanes R.J., McSwain M.V., Povich M.S.
<Astron. J., 155, 190-190 (2018)>
=2018AJ....155..190H 2018AJ....155..190H (SIMBAD/NED BibCode)
ADC_Keywords: H II regions ; Star Forming Region ; Stars, B-type ; Stars, O ;
Binaries, spectroscopic ; Rotational velocities ;
Radial velocities ; Magnitudes
Keywords: binaries: spectroscopic -
open clusters and associations: individual: Carina -
stars: fundamental parameters - stars: massive
Abstract:
The Carina Nebula is an active star-forming region in the southern sky
that is of particular interest due to the presence of a large number
of massive stars in a wide array of evolutionary stages. Here, we present
the results of the spectroscopic analysis of 82 B-type stars and 33 O-type
stars that were observed in 2013 and 2014. For 82 B-type stars without
line blending, we fit model spectra from the Tlusty BSTAR2006 grid to
the observed profiles of Hγ and He λλ4026, 4388,
and 4471 to measure the effective temperatures, surface gravities, and
projected rotational velocities. We also measure the masses, ages, radii,
bolometric luminosities, and distances of these stars. From the radial
velocities measured in our sample, we find 31 single lined spectroscopic
binary candidates. We find a high dispersion of radial velocities among our
sample stars, and we argue that the Carina Nebula stellar population has
not yet relaxed and become virialized.
Description:
Observations of the stars were made at the Anglo-Australian Telescope (AAT)
over the course of two runs in 2013 March and 2014 April. The observations
of these stars are described in greater detail by Alexander et al.
(2016AJ....152..190A 2016AJ....152..190A). We chose two different wavelength regions,
3925-4210 Å (2013) and 4235-4510 Å (2014), to cover many useful
H and He lines for analysis. As the target spectra were vertically stacked
on the imaging plane, distortions in the imaging plane meant that the
exact spectral coverage varied among the targets and sky spectra. During
our first day of observations in 2014, we used a slightly different range
(4200-4475 Å) for some of our exposures, but we found that this omitted
the He I λ4471 line for some of our targets due to variable
dispersion across the chip.
Objects:
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RA (ICRS) DE Designation(s)
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10 44 19.0 -59 53 21 Carina Nebula = NGC 3372
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 47 82 Projected rotational velocities
table2.dat 81 82 Physical parameters
table3.dat 67 82 Radial velocity measurements of B-type stars
table4.dat 67 33 Radial velocity measurements of O-type stars
table5.dat 63 11 Radial velocity measurements of SB2s
table6.dat 67 78 Photometry and derived distances
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See also:
J/ApJ/469/355 : Teff, B-V and BC relation (Flower, 1996)
J/ApJS/194/2 : Chandra Carina Complex Project (CCCP) catalog (Broos+, 2011)
J/ApJS/194/5 : Carina OB stars in the CCCP catalog (Gagne+, 2011)
J/ApJS/194/6 : Candidate X-ray emitting OB stars in Carina (Povich+, 2011)
J/ApJS/194/7 : Global X-ray properties of O and B stars in Carina
(Naze+, 2011)
J/ApJS/194/14 : A Pan-Carina YSO catalog (Povich+, 2011)
J/A+A/572/A116 : The VISTA Carina Nebula Survey (Preibisch+, 2014)
J/MNRAS/465/1807 : Deep OB star population in Carina (Mohr-Smith+, 2017)
J/MNRAS/477/2068 : RV survey of the Carina Nebula's O stars (Kiminki+, 2018)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- ID Star identifier
13- 15 I3 --- S/N13 [4/142]? Signal-to-noise ratio in our 2013
data
17- 19 I3 --- S/N14 [77/267]? Signal-to-noise ratio in our 2014
data
21- 23 I3 km/s vsini4026 [20/250]? Projected rotational velocity for
the He I λλ4026 line
25- 26 I2 km/s e_vsini4026 [5/37]? Uncertainty in vsini4026
28- 30 I3 km/s vsini4388 [20/345]? Projected rotational velocity for
the He I λλ4388 line
32- 33 I2 km/s e_vsini4388 [2/15]? Uncertainty in vsini4388
35- 37 I3 km/s vsini4471 [25/305]? Projected rotational velocity for
the He I λλ4471 line
39- 40 I2 km/s e_vsini4471 [2/20]? Uncertainty in vsini4471
42- 44 I3 km/s vsini [22/345] Projected rotational velocity
weighted average
46- 47 I2 km/s e_vsini [5/37] Uncertainty in vsini
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- ID Star identifier
13- 17 I5 K Teff [15000/29800] Effective temperature
19- 22 I4 K e_Teff [150/2000] Uncertainty in Teff
24- 27 F4.2 [cm/s2] logg [3.15/4.6] Surface gravity (dex)
29- 32 F4.2 [cm/s2] e_logg [0.1/0.27] Uncertainty in logg
34- 38 F5.2 Myr Age [0/74.13] Stellar age
40- 44 F5.2 Myr e_Age [0/63.56] Uncertainty in Age
46- 50 F5.2 Msun M* [4.96/23.51] Stellar mass
52- 56 F5.2 Msun e_M* [0.44/19.04] Uncertainty in M*
58- 62 F5.2 Rsun R* [2.53/18.98] Stellar radius
64- 67 F4.2 Rsun e_R* [0.62/6.18] Uncertainty in R*
69- 74 I6 Lsun Lbol [780/163970] Calculated bolometric luminosity
76- 81 I6 Lsun e_Lbol [270/100500] Uncertainty in Lbol
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Byte-by-byte Description of file: table3.dat table4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- ID Star identifier
13- 18 F6.2 km/s RV13 [-71.22/44.78]? Radial velocity in our 2013 data
20- 24 F5.2 km/s e_RV13 [0.66/17.23]? Uncertainty in RV13
26- 32 F7.2 km/s RV14 [-102.87/53.81]? Radial velocity in our 2014 data
34- 38 F5.2 km/s e_RV14 [0.37/14.32]? Uncertainty in RV14
40- 65 A26 --- Class Classification of star (SB1c=Single-line
spectroscopic binary candidate)
67 A1 --- r_Class [abc] Reference for Class (1)
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Note (1): Reference as follows:
a = Simbad;
b = Sexton et al. (2015MNRAS.446.1047S 2015MNRAS.446.1047S);
c = See Section 3 for details.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- ID Star identifier
11- 17 F7.2 km/s RVp13 [-185.04/44.01] Radial velocity of primary star
in our 2013 data
19- 23 F5.2 km/s e_RVp13 [2.24/11.55] Uncertainty in RVp13
25- 31 F7.2 km/s RVp14 [-129.93/99.07]? Radial velocity of primary star
in our 2014 data
33- 37 F5.2 km/s e_RVp14 [3.99/19.91]? Uncertainty in RVp14
39- 44 F6.2 km/s RVs13 [-58.98/206.76]? Radial velocity of secondary
star in our 2013 data
46- 50 F5.2 km/s e_RVs13 [0.67/33.07]? Uncertainty in RVs13
52- 57 F6.2 km/s RVs14 [-87.22/96.26]? Radial velocity of secondary
star in our 2014 data
59- 63 F5.2 km/s e_RVs14 [2.23/31.15]? Uncertainty in RVs14
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- ID Star identifier
13- 17 F5.2 mag Mbol [-8.31/-2.5]? Bolometric magnitude
19- 22 F4.2 mag e_Mbol [0.87/4.77]? Uncertainty in Mbol
24- 28 F5.2 mag BC [-2.87/-1.24]? Bolometric correction (1)
30- 33 F4.2 mag e_BC [0.03/0.45]? Uncertainty in BC
35- 39 F5.2 mag VMag [-6/-1.23]? Absolute V band magnitude
41- 44 F4.2 mag e_VMag [0.3/4.78]? Uncertainty in VMag
45 A1 --- n_VMag [b] Note on VMag (2)
47- 51 F5.2 mag Vmag [8.1/13.13]? Visible apparent magnitude (3)
52 A1 --- r_Vmag [a] Reference for Vmag (4)
54- 57 F4.2 mag Av [0.38/4.9]? Extinction from Povich et al. (2011,
J/ApJS/194/14)
59- 62 I4 pc Dist [1530/7390]? Distance
64- 67 I4 pc e_Dist [290/3870]? Uncertainty in Dist
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Note (1): The bolometric corrections are interpolated from Flower (1996,
J/ApJ/469/355) and Torres (2010AJ....140.1158T 2010AJ....140.1158T).
Note (2): Note as follows:
b = Estimated based on spectral type following Walborn (1972AJ.....77..312W 1972AJ.....77..312W).
Note (3): The visible apparent magnitudes are from the SIMBAD database unless
otherwise marked, with assumed uncertainty of 0.1.
Note (4): Reference as follows:
a = WEBDA.
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History:
From electronic version of the journal
(End) Tiphaine Pouvreau [CDS] 26-Nov-2018