2013A&A...551A..60W


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.19CET03:30:47

2013A&A...551A..60W - Astronomy and Astrophysics, volume 551A, 60-60 (2013/3-1)

CV1 in the globular cluster M 22: confirming its nature through X-ray observations and optical spectroscopy.

WEBB N.A. and SERVILLAT M.

Abstract (from CDS):

Observations of cataclysmic variables in globular clusters appear to show a dearth of outbursts compared to those observed in the field. A number of explanations have been proposed, including low mass-transfer rates and/or moderate magnetic fields implying higher mass white dwarfs than the average observed in the field. Alternatively this apparent dearth may be simply a selection bias. We examine multi-wavelength data of a new cataclysmic variable, CV1, in the globular cluster M 22 to try to constrain its period and magnetic nature, with an aim at understanding whether globular cluster cataclysmic variables are intrinsically different from those observed in the field. We use the sub-arcsecond resolution of the Chandra ACIS-S to identify the X-ray counterpart to CV1 and analyse the X-ray spectrum to determine the spectral model that best describes this source. We also examine the low resolution optical spectrum for emission lines typical of cataclysmic variables. Cross correlating the Hα line in each individual spectrum also allows us to search for orbital motion. The X-ray spectrum reveals a source best-fitted with a high-temperature bremsstrahlung model and an X-ray unabsorbed luminosity of 1.8x1032 erg/s (0.3-8.0 keV), which are typical of cataclysmic variables. Optical spectra reveal Balmer emission lines, which are indicative of an accretion disc. Potential radial velocity in the Hα emission line is detected and a period for CV1 is proposed. These observations support the CV identification. The radial velocity measurements suggest that CV1 may have an orbital period of ∼7h, but further higher resolution optical spectroscopy of CV1 is needed to unequivocally establish the nature of this CV and its orbital period.

Abstract Copyright:

Journal keyword(s): globular clusters: individual: M 22 - binaries: close - stars: dwarf novae - X-rays: binaries

Nomenclature: Fig. 1, Table 1: [WS2013] NN (Nos 1-39).

Simbad objects: 45

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Number of rows : 45

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 [WS2013] 4 X 01 13.4 +27 12           ~ 1 0
2 CD-28 595 PM* 01 54 50.2704861570 -27 28 35.740415025   12.06 11.51     ~ 116 0
3 OGLE BLG-DN-1056 DN* 18 36 02.70 -23 55 25.3         17.730 ~ 8 0
4 [WGB2002] 8 X 18 36 05.640 -23 50 50.27           ~ 3 0
5 [JVH94] NGC 6656 1 X 18 36 10.450 -23 46 27.38           ~ 4 0
6 [WS2013] 19 X 18 36 12.170 -23 56 23.69           ~ 1 0
7 [WS2013] 11 X 18 36 13.840 -23 54 45.46           ~ 1 0
8 [WS2013] 14 X 18 36 14.370 -23 52 41.76           ~ 1 0
9 [WSG2004] 55 X 18 36 14.93 -23 55 39.9           ~ 2 0
10 [WGB2002] 3 * 18 36 15.1949686001 -23 46 14.329842918           ~ 3 0
11 [WGB2002] 9 X 18 36 15.440 -23 50 56.80           ~ 3 0
12 [WGB2002] 19 CV* 18 36 18.310 -24 00 55.88           ~ 4 0
13 [WGB2002] 11 CV* 18 36 18.400 -23 52 17.19           ~ 4 0
14 [WSG2004] 73 X 18 36 21.040 -23 49 19.50           ~ 2 0
15 [WGB2002] 13 X 18 36 21.700 -23 53 34.99           ~ 3 0
16 [WS2013] 12 X 18 36 22.330 -23 51 40.08           ~ 1 0
17 M 22 GlC 18 36 23.94 -23 54 17.1   7.16 6.17     ~ 1197 0
18 [WS2013] 15 X 18 36 24.100 -23 57 11.20           ~ 1 0
19 [WS2013] 1 X 18 36 24.210 -23 54 10.13           ~ 1 0
20 OGLE BLG-DN-1057 DN* 18 36 24.696 -23 54 35.60     18.77   16.224 ~ 21 0
21 [WGB2002] 18 CV* 18 36 24.860 -23 55 14.92           ~ 4 0
22 [WS2013] 3 X 18 36 25.440 -23 54 51.62           ~ 1 0
23 PSR J1836-2354A Psr 18 36 25.4452 -23 54 52.390           ~ 8 0
24 [WSG2004] 71 X 18 36 25.500 -23 59 09.31           ~ 2 0
25 [WGB2002] 2 X 18 36 27.680 -23 45 06.61           ~ 3 0
26 [WS2013] 7 X 18 36 28.260 -23 55 35.25           ~ 1 0
27 [WGB2002] 21 CV* 18 36 28.290 -23 56 24.64           ~ 4 0
28 [WS2013] 21 X 18 36 30.122 -23 49 59.31           ~ 1 0
29 [WS2013] 36 X 18 36 30.560 -23 44 27.38           ~ 1 0
30 [WS2013] 8 X 18 36 32.880 -23 53 05.35           ~ 1 0
31 [WS2013] 17 X 18 36 33.800 -23 51 37.50           ~ 1 0
32 [WGB2002] 5 X 18 36 34.630 -23 49 29.11           ~ 3 0
33 [WS2013] 16 X 18 36 38.389 -23 54 47.47           ~ 3 0
34 [WGB2002] 14 X 18 36 39.060 -23 53 46.63           ~ 3 0
35 [WS2013] 24 X 18 36 42.940 -23 56 58.94           ~ 1 0
36 [WS2013] 32 X 18 36 56.040 -23 48 44.82           ~ 1 0
37 [WS2013] 37 X 18 36 56.200 -23 47 27.39           ~ 1 0
38 [WS2013] 35 X 18 36 56.820 -23 48 08.59           ~ 1 0
39 [WS2013] 31 X 18 36 59.940 -23 51 29.11           ~ 1 0
40 [WGB2002] 25 X 18 37 00.46 -24 00 23.4           ~ 3 0
41 [WGB2002] 23 X 18 37 00.560 -23 58 29.70           ~ 3 0
42 [WS2013] 30 X 18 37 00.630 -23 56 12.81           ~ 1 0
43 [WS2013] 39 X 18 37 08.630 -23 50 27.36           ~ 1 0
44 NGC 7293 PN 22 29 38.5453078023 -20 50 13.746093105 11.894 13.158 13.524 13.689 13.898 DAO.5 889 0
45 Feige 110 HS* 23 19 58.3995050606 -05 09 56.170282845 10.360 11.45 11.50 11.970 12.145 sdO8VIIIHe5 543 1

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2020.02.19-03:30:47

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