2013MNRAS.429.1354M

Query : 2013MNRAS.429.1354M

2013MNRAS.429.1354M - Mon. Not. R. Astron. Soc., 429, 1354-1366 (2013/February-3)

The massive eclipsing system ALS 1135 and variable stars in the field of the distant OB association bochum 7.

MICHALSKA G., NIEMCZURA E., PIGULSKI A., STESLICKI M. and WILLIAMS A.

Abstract (from CDS):

Using photometric and spectroscopic observations of the double-lined early-type eclipsing binary system ALS 1135, a member of the distant OB association Bochum 7, we derived the new physical and orbital parameters of its components. The masses of both components were derived with an accuracy better than 1 per cent, and their radii, with an accuracy better than 3 per cent. Since the primary's mass is equal to about 25M☉, its radius was subsequently used to derive the age of the system which is equal to 4.3±0.5Myr. The result shows that this method represents a viable alternative to isochrone fitting.

A photometric search of the field of ALS 1135 resulted in the discovery of 17 variable stars, including 7 pulsating ones. One of them is a slowly-pulsating B (SPB) star belonging to Vel OB1, the other six are δ Scuti stars. Of the six δ Scuti stars three might belong to Vel OB1, the other two are likely members of Bochum 7. Given the age of Bochum 7, these two stars are probably pre-main-sequence pulsators. In addition, we provide UBVIC photometry for about 600 stars in the observed field.


Abstract Copyright: © 2012 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2012)

Journal keyword(s): stars: early-type - open clusters and associations: individual: Bochum 7 - open clusters and associations: individual: Vel OB1

Simbad objects: 31

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Number of rows : 31
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 Ass Vel OB 2 As* 08 09 22.478 -47 21 03.46           ~ 307 0
2 CD-45 4447 * 08 43 24.1537949616 -46 08 28.658569200 10.76 11.26 10.77 11.02   O7.5V 20 0
3 TYC 8151-84-1 * 08 43 40.2595470480 -46 03 23.538258612   11.92 11.75     ~ 1 0
4 UCAC2 11950664 * 08 43 43.2318293640 -46 04 41.985301368   16.7   15.76   ~ 1 0
5 USNO-B1.0 0438-00140522 * 08 43 43.9984651296 -46 06 36.222398892   18.6   18.1   ~ 1 0
6 GSC 08151-01812 * 08 43 44.9350784880 -46 06 53.796706740     12.9     B1V 3 0
7 UCAC2 11950680 * 08 43 45.4267551504 -46 06 25.515068040   15.9   15.33   ~ 1 0
8 2MASS J08434620-4604090 * 08 43 46.2128834688 -46 04 09.042475980   19.2   16.8   ~ 1 0
9 GSC 08151-00062 * 08 43 46.8698820408 -46 06 39.058694496     14.2     B3V 4 0
10 USNO-B1.0 0439-00140249 EB* 08 43 47.8481612592 -46 03 24.944144976   20.4   19.8   ~ 2 0
11 TYC 8151-1072-1 * 08 43 48.7934027616 -46 07 33.713704812   12.64 12.66     ~ 7 0
12 CPD-45 2920 EB* 08 43 49.8047993256 -46 07 08.757379416 10.6 11.36 10.99 10.91   O6.5V(n)((f)) 39 1
13 USNO-B1.0 0438-00140645 * 08 43 50.7628557528 -46 07 48.891026784   21.15   19.8 18.27 ~ 1 0
14 CD-45 4462 ** 08 43 51.0870877776 -46 03 46.278754344 11.31 11.87 11.36 11.30   OB- 15 0
15 UCAC3 88-64067 PM* 08 43 51.2856981339 -46 04 37.394493932   15.96     15.69 ~ 1 0
16 UCAC2 11950752 * 08 43 53.3656753344 -46 06 36.598469400   17.09 15.97 15.88   ~ 2 0
17 UCAC3 88-64119 * 08 43 54.61824 -46 03 00.1764   17.6   16.48   ~ 1 0
18 UCAC2 11950762 * 08 43 54.7115705448 -46 03 49.564174680   12.17 11.92 11.95   ~ 1 0
19 2MASS J08435556-4605475 * 08 43 55.5715449888 -46 05 47.566799412   18.30   17.23 16.40 ~ 1 0
20 UCAC2 11950780 * 08 43 57.3564096504 -46 06 22.609403388   14.29 13.81 13.72   ~ 1 0
21 UCAC2 11950806 * 08 44 01.2334866072 -46 07 04.954267380   15.70 15.28 15.10   ~ 1 0
22 2MASS J08440131-4607583 * 08 44 01.3314421704 -46 07 58.610067564       19.3   ~ 1 0
23 2MASS J08440545-4605035 EB* 08 44 05.4581834304 -46 05 03.487960500   18.4   17.4   ~ 2 0
24 UCAC2 11950847 * 08 44 06.3025099056 -46 06 05.499829728   15.08 14.51 14.42   ~ 1 0
25 Cl Bochum 7 OpC 08 44 28.2 -45 55 19   6.94 6.8     ~ 52 0
26 CD-45 4482 WR* 08 44 47.2901340000 -45 58 55.417387548 10.95 11.29 10.74 10.58   WN8h+? 108 0
27 * a Vel * 08 46 01.6443407807 -46 02 29.501411244 3.86 3.91 3.91 3.86 3.73 A0II 66 0
28 Ass Vel OB 1 As* 08 49.9 -45 00           ~ 104 0
29 NAME Vela Field reg ~ ~           ~ 200 0
30 Ass Vel OB 4 * ~ ~           ~ 8 0
31 Ass Vel OB 3 As* ~ ~           ~ 8 0

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