2013A&A...550A..26N


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST03:20:24

2013A&A...550A..26N - Astronomy and Astrophysics, volume 550A, 26-26 (2013/2-1)

Temperature, gravity, and bolometric correction scales for non-supergiant OB stars.

NIEVA M.-F.

Abstract (from CDS):

Precise and accurate determinations of the atmospheric parameters effective temperature and surface gravity are mandatory to derive reliable chemical abundances in OB stars. Furthermore, fundamental parameters like distances, masses, radii, luminosities can also be derived from the temperature and gravity of the stars. Atmospheric parameters recently determined at high precision with several independent spectroscopic indicators in non-local thermodynamic equilibrium, with typical uncertainties of ∼300K for temperature and of ∼0.05dex for gravity, are employed to calibrate photometric relationships. This is in order to investigate whether a faster tool to estimate atmospheric parameters can be provided. Temperatures and gravities of 30 calibrators, i.e. well-studied OB main sequence to giant stars in the solar neighbourhood, are compared to reddening-independent quantities of the Johnson and Stroemgren photometric systems, assuming normal reddening. In addition, we examine the spectral and luminosity classification of the star sample and compute bolometric corrections. Calibrations of temperatures and gravities are proposed for various photometric indices and spectral types. Once the luminosity of the stars is well known, effective temperatures can be determined at a precision of ∼400K for luminosity classes III/IV and ∼800K for luminosity class V. Furthermore, surface gravities can reach internal uncertainties as low as ∼0.08dex when using our calibration to the Johnson Q-parameter. Similar precision is achieved for gravities derived from the β-index and the precision is lower for both atmospheric parameters when using the Stroemgren indices [c1] and [u-b]. In contrast, external uncertainties are larger for the Johnson than for the Stroemgren calibrations. Our uncertainties are smaller than typical differences among other methods in the literature, reaching values up to ±2000K for temperature and ±0.25dex for gravity, and in extreme cases, +6000K and ±0.4dex, respectively. A parameter calibration for sub-spectral types is also proposed. Moreover, we present a new bolometric correction relation to temperature based on our empirical data, rather than on synthetic grids. The photometric calibrations presented here are useful tools to estimate effective temperatures and surface gravities of non-supergiant OB stars in a fast manner. This is also applicable to some single-line spectroscopic binaries, but caution has to be taken for undetected double-lined spectroscopic binaries and single objects with anomalous reddening-law, dubious photometric quantities and/or luminosity classes, for which the systematic uncertainties may increase significantly. We recommend to use these calibrations only as a first step of the parameter estimation, with subsequent refinements based on spectroscopy. A larger sample covering more uniformly the parameter space under consideration will allow refinements to the present calibrations.

Abstract Copyright:

Journal keyword(s): stars: atmospheres - stars: early-type - stars: fundamental parameters

Simbad objects: 34

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Number of rows : 34

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * gam Peg bC* 00 13 14.1512308 +15 11 00.936759 1.75 2.61 2.84 2.94 3.13 B2IV 660 0
2 * zet Cas Pu* 00 36 58.2841866 +53 53 48.867311 2.58 3.47 3.66 3.74 3.95 B2IV 421 0
3 * del Cet bC* 02 39 28.95579 +00 19 42.6345 2.97 3.85 4.07     B2IV 364 0
4 * nu. Eri bC* 04 36 19.1414419 -03 21 08.856678 2.82 3.737 3.928     B2III 366 0
5 * lam Lep * 05 19 34.5240485 -13 10 36.440791 3.03 4.04 4.29 4.41 4.69 B0.5V 270 0
6 * o Ori SB* 05 21 45.7486099227 -00 22 56.910484984 3.79 4.58 4.74 4.79 4.97 B2IV 220 0
7 HD 35299 * 05 23 42.3085483712 -00 09 35.345389512 4.610 5.490 5.700 5.77 5.96 B2III 188 0
8 * gam Ori V* 05 25 07.86325 +06 20 58.9318 0.54 1.42 1.64 1.73 1.95 B2V 495 1
9 * o Tau * 05 27 38.0840639 +21 56 13.073806 3.98 4.719 4.868     B2.5V 147 0
10 HD 35912 * 05 28 01.4701126086 +01 17 53.706832763 5.52 6.212 6.380     B2/3V 126 0
11 HD 36285 * 05 30 20.7534797908 -07 26 05.332049852 5.29 6.130 6.313     B2III 108 0
12 HD 36430 * 05 31 20.8929071446 -06 42 30.163153293 5.29 6.041 6.208     B3V 116 0
13 * ups Ori V* 05 31 55.8601879 -07 18 05.537157 3.30 4.36 4.63 4.75 5.01 O9.7V 379 0
14 HD 36591 V* 05 32 41.3503640106 -01 35 30.577451332 4.240 5.150 5.340     B2II/III 227 1
15 HD 36629 Y*O 05 32 57.0824642468 -04 33 59.334371517 7.01 7.67 7.65 7.53 7.53 B2V 169 0
16 * phi01 Ori SB* 05 34 49.2380370 +09 29 22.487814 3.29 4.26 4.41 4.42 4.59 B0III 243 0
17 HD 36959 Y*O 05 35 01.0063388388 -06 00 33.371107627 4.52 5.33 5.53     B1.2 192 0
18 HD 36960 * 05 35 02.6807398 -06 00 07.303539 3.52 4.50 4.72     B1/2Ib/II 242 0
19 * tet01 Ori A Ae* 05 35 15.8252169327 -05 23 14.332546552 5.87 6.75 6.73 6.42 6.21 B0V 458 1
20 NAME Ori Region reg 05 35 17.30 -05 23 28.0           ~ 480 0
21 * tet02 Ori B Y*O 05 35 26.4004225055 -05 25 00.792538337 5.36 6.29 6.38 6.29 11.050 B2-B5 171 0
22 HD 37744 V* 05 40 37.2961902857 -02 49 30.847246646 5.14 6.02 6.22     B2IV 136 0
23 HD 46202 ** 06 32 10.4728 +04 57 59.818 7.60 8.36 8.19 7.98 7.86 O9.2V 256 0
24 V* PT Pup bC* 07 36 41.0358985359 -19 42 08.425242012 4.65 5.524 5.699     B2II 134 0
25 * P Pup ** 07 49 14.2953578 -46 22 23.542204 2.92 3.93 4.11 4.19 4.36 B0III 141 0
26 * alf Pyx V* 08 43 35.5375544 -33 11 10.989788 2.65 3.50 3.68 3.76 3.93 B1.5III 197 0
27 * chi Cen bC* 14 06 02.7682446 -41 10 46.678780 3.4 4.155 4.343     B2V 203 1
28 * tau Sco * 16 35 52.9528530 -28 12 57.661515 1.55 2.56 2.81 2.93 3.18 B0.2V 854 0
29 * iot Her bC* 17 39 27.8860861 +46 00 22.800110 2.940 3.630 3.800     B3IV 430 1
30 V* V2052 Oph bC* 17 56 18.3998830562 +00 40 13.276647618 5.28 5.874 5.820     B3III 197 0
31 * bet Cep bC* 21 28 39.5968513 +70 33 38.574681 2.05 3.01 3.23 3.33 3.55 B0.5IIIs 683 0
32 * 18 Peg * 22 00 07.9274510425 +06 43 02.812464798 5.31 5.88 6.00     B3III 101 0
33 * 12 Lac bC* 22 41 28.6491950195 +40 13 31.619242453 4.24 5.080 5.229     B2III 343 0
34 * 16 Lac bC* 22 56 23.6292923788 +41 36 13.948197878 4.61 5.436 5.587     B2IV 295 0

    Equat.    Gal    SGal    Ecl

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2020.07.10-03:20:24

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