2020MNRAS.493.2511N

Query : 2020MNRAS.493.2511N

2020MNRAS.493.2511N - Mon. Not. R. Astron. Soc., 493, 2511-2517 (2020/April-1)

Three discoveries of γ Cas analogues from dedicated XMM-Newton observations of Be stars.

NAZE Y., MOTCH C., RAUW G., KUMAR S., ROBRADE J., LOPES DE OLIVEIRA R., SMITH M.A. and TORREJON J.M.

Abstract (from CDS):

In the last years, a peculiarity of some Be stars - their association with unusually hard and intense X-ray emission - was shown to extend beyond a mere few cases. In this paper, we continue our search for new cases by performing a limited survey of 18 Be stars using XMM-Newton. The targets were selected either on the basis of a previous X-ray detection (EXOSAT,ROSAT, XMM-slew survey) without spectral information available or because of the presence of a peculiar spectral variability. Only two targets remain undetected in the new observations and three other stars display only faint and soft X-rays. Short-term and/or long-term variations were found in one third of the sample. The spectral characterization of the X-ray brightest 13 stars of the sample led to the discovery of three new γ Cas (HD 44458, HD 45995, and V558 Lyr), bringing the total to 25 known cases, and another γ Cas candidate (HD 120678), bringing the total to two.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: early-type - stars: massive - stars: variable: general - stars: Be - X-rays: stars

Simbad objects: 45

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Number of rows : 45
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 * gam Cas HXB 00 56 42.5310945 +60 43 00.264089 1.18 2.29 2.39 2.32 2.40 B0.5IVpe 1253 0
2 EM* AS 14 HXB 01 15 59.0548907688 +59 09 14.210267328   11.79 11.36     B2 23 0
3 HD 12882 Be* 02 08 45.4368570096 +65 02 14.726502060 7.36 7.940 7.618     B2.5III:[n]e+ 75 0
4 HD 18552 Be* 03 00 11.8861086336 +38 07 54.197462964 5.67 6.05 6.11     B7IVe 94 0
5 * eta Ori bC* 05 24 28.61672 -02 23 49.7311 2.25 3.18 3.35 3.44 3.65 B1V+B2: 412 0
6 HD 36408A Be* 05 32 14.1413460264 +17 03 29.278298880 5.823 6.103 6.090 6.037   B5V 109 0
7 HD 42054 Em* 06 07 03.6694879368 -34 18 43.279841124 5.14 5.709 5.836     B5Ve 80 0
8 HD 43285 Be* 06 15 40.1766992112 +06 03 58.206616128 5.42 5.94 6.07     B6Ve 115 0
9 HD 44458 Be* 06 21 24.7165403448 -11 46 23.666159604 4.74 5.56 5.55 5.38 5.34 B1.5IVe 165 0
10 HD 45314 Be* 06 27 15.7784072112 +14 53 21.212913660 5.91 6.79 6.64     O9:npe 183 0
11 HD 45995 Be* 06 31 09.5621343984 +11 15 04.953226644 5.20 6.06 6.14     B1.5Vne 164 0
12 * I Hya Be* 09 41 17.0067101149 -23 35 29.451517089 4.07 4.65 4.76 4.75 4.84 B5V 182 0
13 HD 88661 Be* 10 11 46.4595963216 -58 03 37.958712444 4.77 5.66 5.75 5.66 5.70 B5Vne 161 0
14 HD 90563 Em* 10 25 52.4600540400 -58 47 07.130161932 9.98 10.29 9.86 10.12   OB 32 0
15 * kap Dra Be* 12 33 28.9433168544 +69 47 17.659892220 3.18 3.75 3.89 3.84 3.92 B6IIIe 395 0
16 HD 110432 HXB 12 42 50.2663572384 -63 03 31.052981412 4.79 5.58 5.31     B0.5IVpe 334 0
17 V* V851 Cen RS* 13 44 00.9212469648 -61 21 59.173175844   8.74 7.798   6.638 K0III 91 0
18 HD 119682 HXB 13 46 32.5709610312 -62 55 24.156893676 7.26 7.978 7.901 8.72   B0Ve 76 0
19 HD 120678 Em* 13 52 56.4133904568 -62 43 14.260321632 7.04 9.45 8.20 9.02   O9.5Ve 76 0
20 HD 120991 Be* 13 53 57.2397645360 -47 07 41.390612184 5.11 6.03 6.10 6.24 6.34 B2Ve 145 0
21 HD 130437 Be* 14 50 50.2529109240 -60 17 10.355677188 10.20 10.66 10.04 9.93   B1Ve 71 0
22 * mu. Lup Be* 15 18 32.02296 -47 52 30.9957 3.82         B8Ve 112 0
23 HD 135748 * 15 18 33.7769389704 -47 52 45.218033688   6.87 6.76     A2/3(V) 27 0
24 * d Lup Be* 15 35 53.24806 -44 57 30.1982 3.68     6.70   B3V 129 0
25 2MASS J15355876-4456355 Y*? 15 35 58.7676927216 -44 56 35.405594520       12.61   K7IVe 6 0
26 * gam Ara Be* 17 25 23.6593111 -56 22 39.814775 2.25 3.21 3.34     B1Ib 281 0
27 HD 157832 Be* 17 27 54.8113451976 -47 01 34.397043672 5.81 6.636 6.663     B2ne 75 0
28 * alf Ara Be* 17 31 50.4915282 -49 52 34.122041 2.09 2.78 2.95 3.05 3.29 B2Vne 269 0
29 HD 161103 HXB 17 44 45.7656635952 -27 13 44.478959340 8.44 9.23 9.13 9.12   B0.5III/IVe 95 0
30 HD 162718 Be* 17 53 28.4430245688 -24 46 27.644544516 8.94 9.30 8.75 9.38   B3/5ne 61 0
31 HD 316568 Be* 17 54 42.7048988520 -29 43 47.633086740 9.39 9.86 9.66 9.91   B3 39 0
32 V* V986 Oph bC* 18 04 37.3575698448 +01 55 08.375650428 5.23 6.082 6.147     O9.7IIn 121 0
33 2MASS J18081689-1919395 HXB 18 08 16.893 -19 19 39.56           Be? 5 0
34 USNO-A2.0 0750-13340834 HX? 18 30 15.9331562736 -10 45 38.338606548       12.74   Be 3 1
35 ATO J278.3657-10.5901 HXB 18 33 27.7668744360 -10 35 24.439580520     11.9     B0.5Ve 27 0
36 NGC 6649 9 Be* 18 33 28.3004329272 -10 24 08.756967024   12.98 11.76 10.6   B0Ve 26 0
37 * bet Lyr SB* 18 50 04.7951442356 +33 21 45.600371200 2.85 3.42 3.42 3.31 3.29 B8.5Ib-II 955 0
38 3XMM J190144.5+045914 Be* 19 01 44.5787420112 +04 59 14.769044700           O9e-B3e 3 0
39 HD 183362 Be* 19 27 36.3966416760 +37 56 28.307118120 5.46 6.20 6.34     B3Ve 119 0
40 BD+47 3129 HXB 20 30 30.8452150680 +47 51 50.717123784 8.95 9.594 9.273 9.273   B0.5V-IIIe 51 0
41 * f01 Cyg Be* 20 59 49.5541247496 +47 31 15.363746436 3.77 4.71 4.75 4.62 4.63 B1.5Vnne 514 0
42 BD+43 3913 Be* 21 25 02.4437067432 +44 27 06.376740300 9.07 9.33 8.91     B1.5V:nnep 63 0
43 * pi. Aqr Be* 22 25 16.6230017410 +01 22 38.634449478 3.64 4.60 4.64 4.48 4.48 B1III-IVe 436 0
44 * psi02 Aqr Be* 23 17 54.2137206 -09 10 57.067524 3.72 4.26 4.40 4.47 4.60 B5V 157 0
45 HD 220058 Be* 23 20 19.0150387584 +55 48 28.075999176 8.05 8.76 8.59     B2 51 0

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