2022ApJ...926..213K

Query : 2022ApJ...926..213K

2022ApJ...926..213K - Astrophys. J., 926, 213-213 (2022/February-3)

Interferometric Detections of sdO Companions Orbiting Three Classical Be Stars.

KLEMENT R., SCHAEFER G.H., GIES D.R., WANG L., BAADE D., RIVINIUS T., GALLENNE A., CARCIOFI A.C., MONNIER J.D., MERAND A., ANUGU N., KRAUS S., DAVIES C.L., LANTHERMANN C., GARDNER T., WYSOCKI P., ENNIS J., LABDON A., SETTERHOLM B.R. and LE BOUQUIN J.-B.

Abstract (from CDS):

Classical Be stars are possible products of close binary evolution, in which the mass donor becomes a hot, stripped O- or B-type subdwarf (sdO/sdB), and the mass gainer spins up and grows a disk to become a Be star. While several Be+sdO binaries have been identified, dynamical masses and other fundamental parameters are available only for a single Be+sdO system, limiting the confrontation with binary evolution models. In this work, we present direct interferometric detections of the sdO companions of three Be stars-28 Cyg, V2119 Cyg, and 60 Cyg-all of which were previously found in UV spectra. For two of the three Be+sdO systems, we present first orbits and preliminary dynamical masses of the components, revealing that one of them could be the first identified progenitor of a Be/X-ray binary with a neutron star companion. These results provide new sets of fundamental parameters that are crucially needed to establish the evolutionary status and origin of Be stars.

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Be stars - O subdwarf stars - Optical interferometry - Orbit determination - Multiple star evolution

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 - 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 * phi Per Be* 01 43 39.6379691568 +50 41 19.433124998 3.10 4.02 4.06 3.90 3.88 B1.5V:e-shell 594 0
3 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
4 * 28 Tau Be* 03 49 11.2165977912 +24 08 12.156712008 4.73 5.01 5.09   5.08 B8Vne 494 0
5 HD 35165 Be* 05 21 16.8603281544 -34 20 42.173559132 5.24 5.90 6.09 6.12 6.26 B3IVe 79 0
6 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
7 * zet Tau Be* 05 37 38.6854231 +21 08 33.158804 2.22 2.84 3.03 3.06 3.15 B1IVe_shell 751 0
8 HD 41335 Be* 06 04 13.5003372120 -06 42 32.225392980 4.31 5.14 5.21 5.13 5.09 B1V 314 0
9 LS V +22 25 Be* 06 11 49.0761116160 +22 49 32.686712760 11.5 11.788 11.468 11.451   B3V 96 0
10 HD 55606 Be* 07 13 34.1003415384 -02 04 39.100526796 8.28 9.01 9.04     B0.5Vnnpe 66 0
11 HD 58978 Be* 07 26 59.4826856664 -23 05 09.689679528 4.51 5.45 5.56 7.05   B0.5IVe 248 0
12 * O Pup * 07 57 51.7191599448 -45 34 39.608613012   6.389 5.123     K2III 33 0
13 * alf Leo PM* 10 08 22.31099 +11 58 01.9516 0.88 1.24 1.40 1.37 1.47 B8IVn 891 1
14 HD 93521 * 10 48 23.5113981120 +37 34 13.083332412 5.67 6.79 7.03     O9.5IIInn 443 1
15 * del Cen Be* 12 08 21.4976373 -50 43 20.738614 1.51 2.39 2.52 2.48 2.62 B2Vne 320 0
16 * 4 Her Be* 15 55 30.5919435384 +42 33 58.291421364 5.23 5.64 5.75   5.82 B9pe 184 0
17 * del Sco SB* 16 00 20.00528 -22 37 18.1431 1.30 2.20 2.32 2.36 2.49 B0.3IV 776 0
18 HD 161306 Be* 17 45 07.7041298136 -09 48 54.445589568 8.35 8.78 8.30     B3/5Vnne 65 0
19 * z Her Be* 17 50 03.3345672768 +48 23 38.948985636 6.380 6.790 6.890     B6IIInp_sh 168 0
20 * ups Sgr Be* 19 21 43.6225957281 -15 57 18.062726294 4.18 4.71 4.61 4.34 4.21 B2Vp_sh 312 0
21 * 7 Vul Be* 19 29 20.8977162984 +20 16 47.065594296   6.226 6.326     B5Vn 59 1
22 HD 188256 * 19 52 41.5498283184 +38 49 18.059248920   9.01 8.05     G5 15 0
23 HD 188365 * 19 53 23.2062287904 +36 11 51.960342012   8.66 7.78     G5 15 0
24 * b02 Cyg Be* 20 09 25.6190611128 +36 50 22.633958400 4.03 4.80 4.93     B2.5Ve 281 0
25 HD 194335 Be* 20 23 44.3690462664 +37 28 35.209455780 4.82 5.70 5.90     B2IIIe 161 0
26 HD 195647 * 20 31 06.8990574072 +40 51 28.866399300   8.44 7.43     K0III 31 0
27 HD 196215 SB* 20 34 09.3902172648 +45 07 09.110104176   8.84 7.76     K0 7 0
28 HD 196881 * 20 38 35.3241222648 +44 49 30.301664952   9.15 8.15     G5 7 0
29 * 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
30 * 60 Cyg Be* 21 01 10.9277453472 +46 09 20.795190696 4.23 5.226 5.432     B1Ve 217 0
31 HD 204876 * 21 30 04.6771800696 +45 38 12.117975756   9.18 8.13     G5 6 0
32 * eps Cap Be* 21 37 04.8311169408 -19 27 57.640399810 3.69 4.35 4.55 4.60 4.74 B3V 266 0
33 * omi And Be* 23 01 55.2649954408 +42 19 33.655865640 3.00 3.53 3.62 3.61 3.69 B6IV/V_sh 437 0
34 NAME Local Group GrG ~ ~           ~ 9325 0

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