2001A&A...375..122Z


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.01CET08:30:18

2001A&A...375..122Z - Astronomy and Astrophysics, volume 375, 122-129 (2001/8-3)

New spectroscopic observations of the B[e]/K binary system MWC623.

ZICKGRAF F.-J.

Abstract (from CDS):

The B[e]/K binary system MWC 623 was reinvestigated using new spectroscopic observations. The absorption lines of the K and the B star do not exhibit any significant radial velocity variations over a time interval of 14 years. The spectral classification using a recent echelle spectrum yielded spectral types of K2II-Ib and B4III. The luminosity class of the K star gives an estimate of the distance towards MWC 623 of 2.4+1.4–0.9kpc. This is consistent with the kinematic distance of 2.0+0.6–0.3kpc. The masses derived from the locations of the binary components in the H-R diagram are 7±1.5M and 7.5±2.5M for the B and K star, respectively, i.e. the mass ratio is close to 1. Both stars are coeval with an age of 50+10–20 Myr as shown by the comparison with isochrones. The high luminosity of the K star excludes a pre-main sequence evolutionary phase as explanation for the strong LiIλ6708 absorption line observed in the late-type component. Rather, the high lithium abundance is a consequence of the young age. Likewise, the B[e] star is a slightly evolved object starting it post-main sequence evolution.

Abstract Copyright:

Journal keyword(s): stars: circumstellar matter - stars: early-type - stars: late-type - stars: emission-line - stars: evolution

Simbad objects: 17

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Number of rows : 17

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 * ups01 Cas PM* 00 55 00.1554743119 +58 58 21.700075603   6.042 4.820     G8III 97 0
2 * 56 Ori V* 05 52 26.4386495606 +01 51 18.502122905   6.130 4.750     K2-IIb 108 0
3 HD 45677 Be* 06 28 17.4219761127 -13 03 11.130589443 7.86 8.52 8.50 8.11 8.01 B2IV/V[e] 307 0
4 HD 50138 Ae* 06 51 33.3989891154 -06 57 59.445949919 6.28 6.68 6.67     A1Ib/II 202 0
5 Ass Vul OB 4 As* 19 43.1 +24 34           ~ 28 0
6 Ass Vul OB 1 As* 19 44.0 +24 13           ~ 89 0
7 * gam Aql * 19 46 15.5802908 +10 36 47.740788 5.93 4.23 2.72 1.65 0.87 K3II 421 0
8 EM* MWC 623 ** 19 56 31.5416098584 +31 06 20.123592142   11.98 10.92     K2Ib/II+B4III[e] 65 0
9 Ass Cyg OB 3 As* 20 07 +35.9           ~ 171 0
10 Ass Cyg OB 1 As* 20 17.8 +37 38           ~ 252 1
11 * bet Aqr * 21 31 33.5317148 -05 34 16.232006 4.27 3.71 2.89 2.29 1.84 G0Ib 434 0
12 * eps Peg LP* 21 44 11.1561394 +09 52 30.031152 5.61 3.91 2.39 1.34 0.58 K2Ib-II 434 0
13 * 35 Peg PM* 22 27 51.5223252490 +04 41 44.391554789 6.74 5.86 4.80 4.02 3.46 K1-III-IV 257 0
14 Ass Cyg OB 1a As* ~ ~           ~ 2 0
15 Ass Cyg OB 3b As* ~ ~           ~ 3 0
16 Ass Cyg OB 3a As* ~ ~           ~ 2 0
17 Ass Cyg OB 1b As* ~ ~           ~ 2 0

    Equat.    Gal    SGal    Ecl

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2021.03.01-08:30:18

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