2020A&A...638A..21V


Query : 2020A&A...638A..21V

2020A&A...638A..21V - Astronomy and Astrophysics, volume 638A, 21-21 (2020/6-1)

Catalogue of new Herbig Ae/Be and classical Be stars. A machine learning approach to Gaia DR2.

VIOQUE M., OUDMAIJER R.D., SCHREINER M., MENDIGUTIA I., BAINES D., MOWLAVI N. and PEREZ-MARTINEZ R.

Abstract (from CDS):


Context. The intermediate-mass pre-main sequence Herbig Ae/Be stars are key to understanding the differences in formation mechanisms between low- and high-mass stars. The study of the general properties of these objects is hampered by the lack of a well-defined, homogeneous sample, and because few and mostly serendipitously discovered sources are known.
Aims. Our goal is to identify new Herbig Ae/Be candidates to create a homogeneous and well defined catalogue of these objects.
Methods. We have applied machine learning techniques to 4 150 983 sources with data from Gaia DR2, 2MASS, WISE, and IPHAS or VPHAS+. Several observables were chosen to identify new Herbig Ae/Be candidates based on our current knowledge of this class, which is characterised by infrared excesses, photometric variabilities, and Hα emission lines. Classical techniques are not efficient for identifying new Herbig Ae/Be stars mainly because of their similarity with classical Be stars, with which they share many characteristics. By focusing on disentangling these two types of objects, our algorithm has also identified new classical Be stars.
Results. We have obtained a large catalogue of 8470 new pre-main sequence candidates and another catalogue of 693 new classical Be candidates with a completeness of 78.8±1.4% and 85.5±1.2%, respectively. Of the catalogue of pre-main sequence candidates, at least 1361 sources are potentially new Herbig Ae/Be candidates according to their position in the Hertzsprung-Russell diagram. In this study we present the methodology used, evaluate the quality of the catalogues, and perform an analysis of their flaws and biases. For this assessment, we make use of observables that have not been accounted for by the algorithm and hence are selection-independent, such as coordinates and parallax based distances. The catalogue of new Herbig Ae/Be stars that we present here increases the number of known objects of the class by an order of magnitude.

Abstract Copyright: © ESO 2020

Journal keyword(s): catalogs - Hertzsprung-Russell and C-M diagrams - stars: emission-line - Be - stars: formation - stars: pre-main sequence - stars: variables: T Tauri - Herbig Ae/Be

VizieR on-line data: <Available at CDS (J/A+A/638/A21): pms.dat cbe.dat either.dat sample.dat>

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 40

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Number of rows : 40
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 EM* LkHA 201 Ae* 00 43 25.3416969384 +61 38 23.307435816   14 14.3     B2e 23 0
2 HD 36408A * 05 32 14.1413460264 +17 03 29.278298880 5.823 6.103 6.090 6.037   B5V 92 0
3 NAME Ori Region reg 05 35 17.30 -05 23 28.0           ~ 533 0
4 * ome Ori Be* 05 39 11.1463172 +04 07 17.279475 3.73 4.48 4.59 4.57 4.67 B3Ve 397 1
5 BD-10 1351 Ae* 06 02 14.8852964880 -10 00 59.515555464   10.54 10.40     B3V[e] 34 0
6 EM* AS 119 Em* 06 09 25.5040515456 -09 38 49.182807588   13.28 12.36     B3IV[e] 19 1
7 IRAS 06071+2925 Ae? 06 10 17.3285419104 +29 25 16.605726312   14.58 13.73     B9 12 0
8 HD 45677 Be* 06 28 17.4219710352 -13 03 11.128860972 7.86 8.52 8.50 8.11 8.01 B2IV/V[e] 317 0
9 HD 50138 Ae* 06 51 33.3989823840 -06 57 59.450772852 6.28 6.68 6.67     A1Ib/II 209 0
10 HD 50083 Be* 06 51 45.7534246176 +05 05 03.862857048 6.22 6.98 6.92     B3 101 0
11 HD 52721 Ae* 07 01 49.50977 -11 18 03.3219 5.88 6.65 6.59 7.52   B2Vne 208 0
12 * ome CMa Be* 07 14 48.6538664 -26 46 21.609714 2.90 3.64 3.82 3.80 3.90 B2.5Ve 340 0
13 CD-24 5721 Em* 07 39 06.1599984144 -24 45 04.948772328 10.84 11.42 10.94 10.79   B[e] 32 0
14 CD-49 3441 Be* 08 14 20.4677690448 -50 09 46.380031992   10.36 10.34     B8e 17 0
15 HD 76534 Be* 08 55 08.70673 -43 27 59.8852 7.04 7.62 7.50 8.94   B2Vn 120 0
16 HD 85567 Be* 09 50 28.5375988920 -60 58 02.954048268 8.16 8.67 8.57     B5Vne 86 0
17 HD 94509 Be* 10 53 27.2624240616 -58 25 24.524985288   9.28 9.73 9.65   Bp_sh 46 0
18 CD-48 7859 Be* 13 01 17.8030714320 -48 53 18.799911852   10.65 10.58     B5e 49 0
19 HD 114981 Be* 13 14 40.6843201920 -38 39 05.650899840 6.43 7.07 7.12     B5V 46 0
20 HD 130437 Be* 14 50 50.2529109240 -60 17 10.355677188 10.20 10.66 10.04 9.93   B1Ve 61 0
21 HD 328990 Be* 16 50 25.3884774648 -46 09 19.086796008 10.68 11.06 10.71 10.61   Be 13 0
22 * c Oph Be* 17 31 24.9541340 -23 57 45.513592 4.75 4.81 4.81 4.74 4.72 A0V 264 0
23 BD+23 3183 Em* 17 47 03.2744329776 +23 19 45.354097632   10.04 10.01     Be 15 0
24 EM* MWC 930 s*b 18 26 25.2364693368 -07 13 17.815243512   14.20 11.51 11.87 9.40 B5/9Iaeq 44 1
25 EM* LkHA 348 Em* 18 34 12.6529075104 -00 26 21.795198000     14.3     F6 32 0
26 HD 174571 Be* 18 50 47.1747632184 +08 42 10.084999896 9.19 9.382 8.892 9.06   B2.5V:[n]e 66 0
27 BD+14 3887 Em* 19 21 33.9771479376 +14 52 56.910478296 11.86 11.3 9.89     B3Ibe 88 0
28 IRAS 19455+2319 C* 19 47 39.8597043816 +23 26 39.313617576           C-rich 9 0
29 EM* MWC 623 ** 19 56 31.5417133728 +31 06 20.124534348   11.98 10.92     K2Ib/II+B4III[e] 68 0
30 EM* MWC 342 Em* 20 23 03.6172964112 +39 29 49.920095616 11.62 11.5 10.6     B[e] 80 1
31 BD+41 3731 Ae* 20 24 15.7159041312 +42 18 01.384401852 9.51 9.89 9.84     B3n 99 1
32 AT 2018awf Em* 20 31 48.8484352416 +40 38 00.063295692   14.75 12.87     B1II 13 0
33 EM* LkHA 167 Ae* 20 52 04.6428035640 +44 37 30.437414400   17.0       A1/9e 28 0
34 IC 1396 OpC 21 38 59 +57 30.8           ~ 460 1
35 EM* MWC 645 Em* 21 53 27.4866658080 +52 59 58.019076852   13.72 13.00 12.98   B[e] 45 0
36 EM* MWC 1055 Em* 22 08 25.4277987048 +54 13 26.164151040   12.51 12.10     Be 23 0
37 EM* GGR 71 Em* 22 26 38.7333592272 +61 13 31.568432916   13.55 12.47     B[e] 27 0
38 HD 240010 Be* 22 38 31.8300730272 +55 50 05.393150808 9.26 9.58 9.19     B1:IV:nnpe 56 0
39 EM* MWC 657 Be* 22 42 41.8293417264 +60 24 00.649510452           Be 30 0
40 EM* LkHA 350 Ae* 22 49 07.2108315768 +62 11 08.373499152   16 14.02     B8e 25 0

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2022.05.28-09:49:51

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