2012A&A...537A..76S

Query : 2012A&A...537A..76S

2012A&A...537A..76S - Astronomy and Astrophysics, volume 537A, 76-76 (2012/1-1)

A new super-soft X-ray source in the Small Magellanic Cloud: discovery of the first Be/white dwarf system in the SMC ?

STURM R., HABERL F., PIETSCH W., COE M.J., MEREGHETTI S., LA PALOMBARA N., OWEN R.A. and UDALSKI A.

Abstract (from CDS):

The Small Magellanic Cloud (SMC) hosts a large number of Be/X-ray binaries, however no Be/white dwarf system is known so far, although population synthesis calculations predict that they might be more frequent than Be/neutron star systems. XMMUJ010147.5-715550 was found as a new faint super-soft X-ray source (SSS) with a likely Be star optical counterpart. We investigate the nature of this system and search for further high-absorbed candidates in the SMC. We analysed the XMM-Newton X-ray spectrum and light curve, optical photometry, and the I-band OGLE III light curve. The X-ray spectrum is well represented by black-body and white dwarf atmosphere models with highly model-dependent temperature between 20 and 100eV. The likely optical counterpart AzV281 showed low near infrared emission during X-ray activity, followed by a brightening in the I-band afterwards. We find further candidates for high-absorbed SSSs with a blue star as counterpart. We discuss XMMUJ010147.5-715550 as the first candidate for a Be/white dwarf binary system in the SMC.

Abstract Copyright: ∼

Journal keyword(s): X-rays: binaries - galaxies: stellar content - white dwarfs - stars: emission-line, Be - galaxies: individual: SMC

Nomenclature: Table 3 : [SHP2012] JHHMMSS.ss+DDMMSS.s N=10

Simbad objects: 21

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Number of rows : 21
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 [SHP2012] J004913.54-732600.0 X 00 49 13.54 -73 26 00.0           ~ 1 0
2 AzV 102 HXB 00 51 53.1358981896 -72 31 48.721904580 13.66 14.79 14.38   14.40 B0-5(II) 71 0
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 11146 1
4 RX J0053.9-7226 HXB 00 53 55.181 -72 26 44.88   14.65 14.72   14.757 B1III 93 0
5 [MA93] 744 Em* 00 54 12.54 -72 14 47.8     16.4     ~ 2 0
6 [SHP2012] J005414.97-721443.1 X 00 54 14.974 -72 14 43.12           ~ 2 0
7 [SHP2012] J005507.25-720825.7 HX? 00 55 07.250 -72 08 25.70           ~ 3 0
8 [SHP2012] J005508.45-725826.7 X 00 55 08.45 -72 58 26.7           ~ 1 0
9 [SHP2012] J005954.57-721530.5 X 00 59 54.567 -72 15 30.48           ~ 2 0
10 [SHP2012] J010105.01-720443.5 X 01 01 05.008 -72 04 43.47           ~ 2 0
11 LIN 384 HXB 01 01 47.9034089160 -71 55 51.133004508 13.26 14.40 14.47   14.30 B0e 22 0
12 [MA93] 1393 HXB 01 03 37.5349856136 -72 01 33.204096336   14.54 14.65     B0III-V 73 0
13 SNR B0102-72.3 SNR 01 04 01.2 -72 01 52           ~ 397 1
14 NAME SMC Bar PoG 01 05 -72.6           ~ 235 0
15 [SHP2012] J010516.05-720025.0 X 01 05 16.048 -72 00 24.98           ~ 2 0
16 [MA93] 1845 HXB 01 17 40.1630558064 -73 30 50.523690888 13.30 14.14 14.18   14.09 B1-3(II)e 55 0
17 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7064 0
18 SV* HV 5682 XB* 05 13 50.7836696744 -69 51 47.483136927     16.566 16.606 16.62 ~ 314 0
19 UCAC2 1799680 Em* 05 20 16.1483853648 -69 25 05.368802196 13.905 15.099 14.98 14.96 14.665 ~ 16 2
20 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 17430 0
21 2E 1550 XB* 05 43 34.1600044704 -68 22 22.191505716   15.9   17.2 16.54 ~ 324 0

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