2013A&A...550A..93G


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.21CEST16:17:25

2013A&A...550A..93G - Astronomy and Astrophysics, volume 550A, 93-93 (2013/2-1)

A new look at the long-period eclipsing binary V383 Scorpii.

GALAN C., TOMOV T., KATO T., POJMANSKI G., SZCZYGIEL D.M., PILECKI B., GRACZYK D., GROMADZKI M., MIKOLAJEWSKI M., GIEREN W., STROBEL A. and ROUKEMA B.F.

Abstract (from CDS):

The system V383 Sco was discovered to be an eclipsing binary star at the beginning of the twentieth century. This system has one of the longest orbital periods known (13.5yr) and was initially classified as a ζ Aur-type eclipsing variable. It was then forgotten about for decades, with no progress made in understanding it. This study provides a detailed look at the system V383 Sco, using new data obtained before, during, and after the last eclipse, which occurred in 2007/8. There was a suspicion that this system could be similar to eclipsing systems with extensive dusty disks like EECep and ε Aur. This and other, alternative hypotheses are considered here. The All Sky Automated Survey (ASAS-3) V and I light curves have been used to examine apparent magnitude and colour changes. Low- and high-resolution spectra have been obtained and used for spectral classification, to analyse spectral line profiles, as well as to determine the reddening, radial velocities and the distance to the system. The spectral energy distribution (SED) was analysed using all available photometric and spectroscopic data. Using our own original numerical code, we performed a very simplified model of the eclipse, taking into account the pulsations of one of the components. The low-resolution spectrum shows apparent traces of molecular bands, characteristic of an M-type supergiant. The presence of this star in the system is confirmed by the SED, by a strong dependence of the eclipse depth on the photometric bands, and by the nature of pulsational changes. The presence of a very low excitation nebula around the system has been inferred from [OI] 6300Å emission in the high-resolution spectrum. Analysis of the radial velocities, reddening, and period-luminosity relation for Mira-type stars imply a distance to the V383 Sco system of 8.4±0.6kpc. The distance to the nearby V381 Sco is 6.4±0.8kpc. The very different and oppositely directed radial velocities of these two systems (89.8km/s vs. -178.8km/s) seem to be in agreement with a bulge/bar kinematic model of the Galactic centre and inconsistent with purely circular motion. We have found strong evidence for the presence of a pulsating M-type supergiant in the V383Sco system. This supergiant periodically obscures the much more luminous F0I-type star, causing the deep (possibly total) eclipses which vary in duration and shape.

Abstract Copyright:

Journal keyword(s): binaries: eclipsing - circumstellar matter - stars: mass-loss - stars: oscillations - stars: winds, outflows - galaxy: kinematics and dynamics

VizieR on-line data: <Available at CDS (J/A+A/550/A93): tableb1.dat tableb2.dat tableb3.dat tableb4.dat>

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 - 2020
#notes
1 * eps Aur Al* 05 01 58.1290610816 +43 49 23.871349520 3.86 3.53 2.99 2.47 2.02 A9Ia 558 0
2 L 595-22 PM* 05 56 24.7419816722 -27 51 32.362978169   12.31 12.38     sdG 145 0
3 HD 75276 * 08 47 18.8444795339 -46 09 19.493144444 6.71 6.263 5.748 6.73   F0III 68 0
4 V* V399 Car Ce* 10 27 24.4689104255 -57 38 19.691371729 5.29 5.18 4.70 4.10 3.62 A9/F0Ia/ab 129 0
5 HD 306989 Be* 11 43 06.5284 -60 44 04.479 8.95 10.56 10.22 10.52   B3 35 0
6 V* RX Boo AB* 14 24 11.6240733185 +25 42 13.381760051   9.23 8.60     M7.5-M8 419 0
7 V* UU Her RV* 16 35 57.2848521238 +37 58 02.106865050   9.54 8.50     F5Ib 107 0
8 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11758 0
9 V* V381 Sco Al* 17 47 03.4302288560 -35 47 06.776369802   12.55 11.32     A8II 16 0
10 V* V383 Sco Al* 17 53 34.4454380895 -38 05 00.659813835   11.54 10.55     F0Iab:e 8 0
11 HD 172481 pA* 18 41 36.9594749880 -27 57 01.239866482   9.58 9.06     F2/3Ia 47 0
12 V* BL Tel Al* 19 06 38.1096125605 -51 25 03.222666967 8.03 7.72 7.10     F5Iab/b 89 0
13 * chi Cyg S* 19 50 33.9243904 +32 54 50.609683 7.02 6.06 4.24 1.81 -0.01 S6-9/1-2e 665 0
14 CD-30 17706 WD* 20 10 56.8485174654 -30 13 06.629141494 11.654 12.286 12.242 12.311 12.381 DA3.1 221 0
15 V* VV Cep Al* 21 56 39.1438495 +63 37 32.017439 7.03 6.65 4.90 3.19 1.85 M2epIa-Iab+B8:eV 428 1
16 BD+55 2693 Be* 22 09 22.7549066011 +55 45 24.256335493 10.88 11.1 10.9     B5:nev 73 0
17 LP 877-23 PM* 22 52 41.0353308036 -20 35 32.995847106   13.02 11.90     ~ 104 0

    Equat.    Gal    SGal    Ecl

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2020.10.21-16:17:25

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