2022A&A...666A..23M


Query : 2022A&A...666A..23M

2022A&A...666A..23M - Astronomy and Astrophysics, volume 666A, 23 (2022/10-1)

Towards a consistent model of the hot quadruple system HD 93206 = QZ Carinæ I. Observations and their initial analyses.

MAYER P., HARMANEC P., ZASCHE P., BROZ M., CATALAN-HURTADO R., BARLOW B.N., FRONDORF W., WOLF M., DRECHSEL H., CHINI R., NASSERI A., PIGULSKI A., LABADIE-BARTZ J., CHRISTIE G.W., WALKER W.S.G., BLACKFORD M., BLANE D., HENDEN A.A., BOHLSEN T., BOZIC H. and JONAK J.

Abstract (from CDS):

The hot nine-component system HD 93206, which contains a gravitationally bounded eclipsing Ac1+Ac2 binary (P = 5.9987 d) and a spectroscopic Aa1+Aa2 (P = 20.734 d) binary can provide important insights into the origin and evolution of massive stars. Using archival and new spectra, and a rich collection of ground-based and space photometric observations, we carried out a detailed study of this object. We provide a much improved description of both short orbits and a good estimate of the mutual period of both binaries of about 14 500 d (i.e. 40 years). For the first time, we detected weak lines of the fainter component of the 6.0 d eclipsing binary in the optical region of the spectrum, measured their radial velocities, and derived a mass ratio of MAc2/MAc1 = 1.29, which is the opposite of what was estimated from the International Ultraviolet explorer (IUE) spectra. We confirm that the eclipsing subsystem Ac is semi-detached and is therefore in a phase of large-scale mass transfer between its components. The Roche-lobe filling and spectroscopically brighter component Ac1 is the less massive of the two and is eclipsed in the secondary minimum. We show that the bulk of the Hα emission, so far believed to be associated with the eclipsing system, moves with the primary O9.7 I component Aa1 of the 20.73 d spectroscopic binary. However, the weak emission in the higher Balmer lines seems to be associated with the accretion disc around component Ac2. We demonstrate that accurate masses and other basic physical properties including the distance of this unique system can be obtained but require a more sophisticated modelling. A first step in this direction is presented in the accompanying Paper II (Brož et al.).

Abstract Copyright: © P. Mayer et al. 2022

Journal keyword(s): binaries: eclipsing - stars: early-type - stars: fundamental parameters - stars: individual: HD 9320 (QZ Carinæ)

VizieR on-line data: <Available at CDS (J/A+A/666/A23): table6a.dat table6b.dat table6c.dat table6d.dat>

Simbad objects: 16

goto Full paper

goto View the references in ADS

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 - 2024
#notes
1 HD 92741 * 10 41 12.3507121464 -59 58 25.042725912 6.41 9.02 8.77 8.40   B1/2II 54 0
2 HD 93131 WR* 10 43 52.2579213120 -60 07 04.019676456 5.52 6.43 6.48 7.46   WN6ha-w 298 0
3 Cl Collinder 228 OpC 10 44 00 -60 05.2           ~ 207 0
4 HD 305536 Y*O 10 44 11.0717950440 -60 03 21.545490888 8.17 8.99 8.971 9.57   O9.5V 53 0
5 HD 305522 * 10 44 14.9655595968 -60 00 05.678223120 8.99 9.77 9.69 9.95   B0V+B1V 25 0
6 HD 93206B SB* 10 44 22.829518 -59 59 35.09888   10.27 10.01     O8III+O9V 5 1
7 HD 93206 SB* 10 44 22.9085235888 -59 59 35.970489960 5.53 6.37 6.24 7.42   O9.7Ibn 215 0
8 HD 93206A SB* 10 44 22.910 -59 59 35.95   6.398 6.313     O9.5Ib 10 0
9 HD 305523 * 10 44 29.4771423744 -59 57 18.094514724 7.82 8.64 8.50 9.25   O9II-III 71 0
10 HD 93222 Y*O 10 44 36.2481200208 -60 05 28.890759120 7.26 8.18 8.10 8.91   O7V((f))z 198 0
11 NGC 3372 HII 10 45 02.23 -59 41 59.8           ~ 1014 2
12 * eta Car Em* 10 45 03.545808 -59 41 03.95124 6.37 7.03 6.48 6.123 4.41 LBV 2442 0
13 HD 93683 Be* 10 47 38.8785531792 -60 37 04.271539296 7.20 8.12 7.87 8.78   O9V+B0V 46 0
14 HD 93695 V* 10 47 44.3174678544 -59 52 30.921185136   6.35 6.47     B3V 45 0
15 HD 96548 WR* 11 06 17.2032351624 -65 30 35.241182028 7.10 7.80 7.70 8.49   WN8h 413 0
16 * bet Lyr SB* 18 50 04.7951442356 +33 21 45.600371200 2.85 3.42 3.42 3.31 3.29 B8.5Ib-II 926 0

To bookmark this query, right click on this link: simbad:objects in 2022A&A...666A..23M and select 'bookmark this link' or equivalent in the popup menu