2018A&A...616A...8A

Query : 2018A&A...616A...8A

2018A&A...616A...8A - Astronomy and Astrophysics, volume 616A8-8 (2018/8-1)

Gaia Data Release 2. First stellar parameters from Apsis.

ANDRAE R., FOUESNEAU M., CREEVEY O., ORDENOVIC C., MARY N., BURLACU A., CHAOUL L., JEAN-ANTOINE-PICCOLO A., KORDOPATIS G., KORN A., LEBRETON Y., PANEM C., PICHON B., THEVENIN F., WALMSLEY G. and BAILER-JONES C.A.L.

Abstract (from CDS):

The second Gaia data release (Gaia DR2) contains, beyond the astrometry, three-band photometry for 1.38 billion sources. One band is the G band, the other two were obtained by integrating the Gaia prism spectra (BP and RP). We have used these three broad photometric bands to infer stellar effective temperatures, Teff, for all sources brighter than G=17mag with Teff in the range 3000-10000K (some 161 million sources). Using in addition the parallaxes, we infer the line-of-sight extinction, AG, and the reddening, E(BP-RP), for 88 million sources. Together with a bolometric correction we derive luminosity and radius for 77 million sources. These quantities as well as their estimated uncertainties are part of Gaia DR2. Here we describe the procedures by which these quantities were obtained, including the underlying assumptions, comparison with literature estimates, and the limitations of our results. Typical accuracies are of order 324K (Teff), 0.46mag (AG), 0.23mag (E(BP-RP)), 15% (luminosity), and 10% (radius). Being based on only a small number of observable quantities and limited training data, our results are necessarily subject to some extreme assumptions that can lead to strong systematics in some cases (not included in the aforementioned accuracy estimates). One aspect is the non-negativity contraint of our estimates, in particular extinction, which we discuss. Yet in several regions of parameter space our results show very good performance, for example for red clump stars and solar analogues. Large uncertainties render the extinctions less useful at the individual star level, but they show good performance for ensemble estimates. We identify regimes in which our parameters should and should not be used and we define a "clean" sample. Despite the limitations, this is the largest catalogue of uniformly-inferred stellar parameters to date. More precise and detailed astrophysical parameters based on the full BP/RP spectrophotometry are planned as part of the third Gaia data release.

Abstract Copyright: © ESO 2018

Journal keyword(s): stars: fundamental parameters - methods: data analysis - methods: statistical - surveys - catalogs

VizieR on-line data: <CDS Catalogue: I/345>

CDS comments: Fig.27 the star in Onehag et al.2011 (2011A&A...528A..85O) is Cl* NGC 2682 YBP 1194. M67-658 not identified.

Simbad objects: 57

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Number of rows : 57
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 Cl Blanco 1 OpC 00 03 04.1 -29 48 55           ~ 380 0
2 NGC 188 OpC 00 47 14.8 +85 14 42           ~ 990 0
3 NGC 752 OpC 01 56 53.7 +37 45 06           ~ 712 0
4 Cl Stock 2 OpC 02 15 47.8 +59 33 12           ~ 155 0
5 NGC 869 OpC 02 18 57.0 +57 08 02           ~ 504 0
6 NGC 884 OpC 02 22 15.7 +57 08 59           ~ 503 0
7 Cl Trumpler 2 OpC 02 36 14.9 +55 54 32           ~ 124 0
8 NGC 1039 OpC 02 42 09.1 +42 44 02           ~ 467 0
9 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
10 Cl Melotte 20 MGr 03 26 50.6 +48 51 48           ~ 928 0
11 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
12 NGC 1499 HII 04 03 18 +36 25.3           ~ 179 0
13 NAME Auriga reg 04 20 00.0 +38 05 00           ~ 238 0
14 Cl Melotte 25 OpC 04 30 27.4 +16 46 43           ~ 3309 0
15 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
16 NGC 1901 OpC 05 18 45.8 -68 09 13           ~ 123 0
17 M 42 HII 05 35 16.8 -05 23 15           ~ 4411 0
18 NAME Orion Molecular Cloud MoC 05 56 -01.8           ~ 1227 1
19 NGC 2158 OpC 06 07 26.7 +24 05 53           ~ 317 0
20 NGC 2168 OpC 06 09 07.5 +24 20 15           ~ 604 0
21 NGC 2232 OpC 06 27 45.6 -04 44 26           ~ 212 0
22 NGC 2323 OpC 07 02 47.3 -08 22 07           ~ 212 0
23 NGC 2360 OpC 07 17 45.8 -15 38 21           ~ 213 0
24 Cl Collinder 140 OpC 07 23 23.9 -31 58 15           ~ 154 0
25 NGC 2422 OpC 07 36 35.8 -14 30 15           ~ 275 0
26 NGC 2423 OpC 07 37 11.3 -13 51 45           ~ 175 0
27 NGC 2437 OpC 07 41 45.4 -14 50 42           ~ 174 0
28 NGC 2447 OpC 07 44 34.6 -23 51 22           ~ 170 1
29 NGC 2451 Cl* 07 45.4 -37 58           ~ 165 1
30 NGC 2516 OpC 07 58 00.5 -60 46 36           ~ 793 0
31 NGC 2547 OpC 08 10 01.5 -49 12 08           ~ 445 0
32 NGC 2548 OpC 08 13 34.0 -05 43 11           ~ 227 0
33 NGC 2632 OpC 08 39 58.4 +19 36 33           ~ 1733 0
34 IC 2391 OpC 08 41 17.5 -53 03 00           ~ 871 0
35 Cl Trumpler 10 OpC 08 47 46.4 -42 31 52           ~ 203 0
36 Cl* NGC 2682 YBP 1194 * 08 51 00.8052676222 +11 48 52.795639755 15.546 15.28 14.676   13.876 G5V 84 1
37 NGC 2682 OpC 08 51 23.5 +11 48 54           ~ 2528 0
38 NGC 3228 OpC 10 21 34.1 -51 45 39           ~ 98 0
39 IC 2602 OpC 10 42 55.9 -64 25 22           ~ 735 0
40 NGC 3532 OpC 11 05 33.9 -58 42 13           ~ 414 0
41 Cl Melotte 111 OpC 12 11 54.9 +25 16 36           ~ 520 0
42 NGC 6025 OpC 16 03 09.4 -60 26 59           ~ 117 0
43 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1
44 NGC 6281 OpC 17 04 44.6 -37 57 08           ~ 156 0
45 IC 4651 OpC 17 24 48.5 -49 55 23           ~ 374 0
46 NGC 6405 OpC 17 40 14.5 -32 14 16           ~ 235 0
47 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
48 IC 4665 OpC 17 46 04.0 +05 36 54           ~ 407 0
49 NGC 6475 OpC 17 53 44.1 -34 49 36           ~ 413 0
50 NGC 6633 OpC 18 27 30.2 +06 38 21           ~ 423 0
51 IC 4725 OpC 18 31 47.5 -19 07 37           ~ 239 0
52 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0V 2787 1
53 IC 4756 OpC 18 38 39.0 +05 26 14           ~ 274 0
54 NGC 6774 OpC 19 16 17.6 -16 20 45           ~ 258 0
55 NGC 6793 OpC 19 23 16.4 +22 08 54           ~ 53 0
56 NGC 6819 OpC 19 41 18.3 +40 11 19   8.21 7.3     ~ 719 0
57 NGC 7092 OpC 21 31 04.0 +48 17 47           ~ 245 0

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