2000A&AS..147....5M


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.20CET13:03:21

2000A&AS..147....5M - Astron. Astrophys., Suppl. Ser., 147, 5-24 (2000/November-2)

Spectroscopy and photometry of the emission-line B-type stars AS 78 and MWC 657.

MIROSHNICHENKO A.S., CHENTSOV E.L., KLOCHKOVA V.G., KURATOV K.S., SHEIKINA T.A., MUKANOV D.B., BJORKMAN K.S., GRAY R.O., RUDY R.J., LYNCH D.K., MAZUK S., PUETTER R., GARCIA-LARIO P., PEREA J.V. and BERGNER Y.K.

Abstract (from CDS):

We present the results of low- and high-resolution spectroscopic and multicolour photometric observations of two early-type emission-line stars, AS 78 and MWC 657. They were identified by Dong & Hu (1991) with the IRAS sources 03549+5602 and 22407+6008, respectively, among many other sources displaying a very strong infrared excess, V-[25]≥8mag AS 78 is recognized as a photometric variable for the first time. A large near-IR excess radiation is detected in AS 78 and confirmed by new, higher-quality, data for MWC 657. Significant variations in the Balmer line profiles are detected for both objects. Modelling of the Balmer line profiles of AS 78 obtained in 1994 yields the following parameters of the star and its wind: Teff∼17000K, logLbol/L∼4.0, {dot}(M)∼10–6M/yr. The photometric and new spectroscopic data indicate that the star's Teff increases with time, while the stellar wind changes its structure. Distances towards both objects are estimated on the basis of their radial velocities and the galactic rotation curve. Consideration of different options about the nature and evolutionary state of both objects leads us to suggest that they are binary systems containing a B-type intermediate-luminosity star and a gaseous disk around the less luminous component.

Abstract Copyright:

Journal keyword(s): techniques: photometric - techniques: spectroscopic - stars: emission-line - stars: circumstellar matter - stars: individual (AS 78, MWC 657)

VizieR on-line data: <Available at CDS (J/A+AS/147/5): table9.dat table9.tex>

Simbad objects: 16

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Number of rows : 16

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 ACO S 78 ClG 00 47 30 -48 14.6           ~ 5 0
2 LF 6 +56 112 Em* 03 54 32.8449 +56 50 49.912 12.638 10.81 10.25     B4IIe 12 0
3 BD+55 837 * 03 58 01.7265511275 +55 54 55.585721122 11.66 10.18 9.66     B1Ib: 25 0
4 V* MO Cam Be* 03 58 59.4436379432 +56 11 12.626367652 13.618 11.97 11.26     Be 28 0
5 HD 237204 * 04 00 23.2814806416 +56 54 05.758560233 10.493 9.40 9.18     B0.5V 36 0
6 BD+55 838 * 04 00 42.5908815382 +55 29 03.157279220 11.749 10.01 9.32     B3Ib 25 0
7 HD 237211 s*b 04 03 15.6484178687 +56 32 24.874130707 10.579 9.41 9.05     O9.5Iab 40 0
8 HD 237213 s*b 04 04 24.5575459164 +56 00 19.465290892 11.19 9.39 8.74     B6Ia 39 0
9 V* CI Cam HXB 04 19 42.1353986687 +55 59 57.708146070 12.13 12.41 11.77 10.79 9.99 B0/2I[e] 222 0
10 HD 87643 Em* 10 04 30.2845136666 -58 39 52.138769673 8.92 10.38 9.50 9.68   B3I[e] 133 0
11 HD 94878 bL* 10 55 58.9150038252 -60 23 33.434805592 8.67 9.37 8.70 8.07   B0/2eq 138 0
12 HD 316285 s*b 17 48 14.0369781568 -28 00 53.124817157 11.88 11.27 9.60 9.28   B0Ieq 178 2
13 EM* MWC 623 ** 19 56 31.5416098584 +31 06 20.123592142   11.98 10.92     K2Ib/II+B4III[e] 61 0
14 * P Cyg s*b 20 17 47.2020844 +38 01 58.552724 4.66 5.24 4.82 4.28 4.02 B1-2Ia-0ep 1128 1
15 EM* MWC 342 Em* 20 23 03.6174326238 +39 29 49.919006537 11.62 11.5 10.6     B[e] 71 1
16 EM* MWC 657 Be* 22 42 41.8291884368 +60 24 00.646735968           Be 27 0

    Equat.    Gal    SGal    Ecl

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2020.02.20-13:03:21

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