2006A&A...446.1095B


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.19CET23:22:23

2006A&A...446.1095B - Astronomy and Astrophysics, volume 446, 1095-1105 (2006/2-2)

Multiwavelength monitoring of BD+53 2790, the optical counterpart to 4U 2206+54.

BLAY P., NEGUERUELA I., REIG P., COE M.J., CORBET R.H.D., FABREGAT J. and TARASOV A.E.

Abstract (from CDS):

We present the results of our long-term monitoring of BD+53 2790, the optical counterpart to the X-ray source 4U 2206+54. Unlike previous studies that classify the source as a Be/X-ray binary, we find that its optical and infrared properties differ from those of typical Be stars: the variability of the V/R ratio is not cyclical; there are variations in the shape and strength of the Hα emission line on timescales less than 1 day; and no correlation between the EW and the IR magnitudes or colors is seen. Our observations suggest that BD+53 2790 is very likely a peculiar O9.5V star. In spite of exhaustive searches we cannot find any significant modulation in any emission line parameter or optical/infrared magnitudes. Spectroscopy of the source extending from the optical to the K-band confirms the peculiarity of the spectrum: not only are the He lines stronger than expected for an O9.5V star but also there is no clear pattern of variability. The possibility that BD+53 2790 is an early-type analogue to He-strong stars (like θ1 Ori C) is discussed.

Abstract Copyright:

Journal keyword(s): stars: early-type - stars: emission-line, Be - stars: magnetic fields - stars: individual: BD+53 2790

Simbad objects: 5

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Number of rows : 5

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 * tet01 Ori C ** 05 35 16.46375 -05 23 22.8486 4.20 5.15 5.13 4.91 4.73 O7Vp 1265 1
2 BD+33 2790 * 16 51 24.2354080607 +33 21 55.942450609   10.94 10.54     F2 1 0
3 V* V479 Sct HXB 18 26 15.0561532140 -14 50 54.249464136 12.02 12.23 11.27 11.04   ON6V((f))z 488 2
4 BD+53 2790 HXB 22 07 56.2368407539 +54 31 06.405811141 9.4 10.11 9.84 9.64 9.43 O9.5Vep 171 0
5 * 10 Lac ** 22 39 15.6786372 +39 03 00.971152 3.650 4.670 4.880 4.98 5.19 O9V 717 0

    Equat.    Gal    SGal    Ecl

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2020.02.19-23:22:23

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