2001A&A...375..387V


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST23:04:01

2001A&A...375..387V - Astronomy and Astrophysics, volume 375, 387-396 (2001/8-4)

An optical study of X-ray sources in the old open clusters NGC752 and NGC6940.

VAN DEN BERG M. and VERBUNT F.

Abstract (from CDS):

We observed the optical counterparts of X-ray sources in the old open clusters NGC 752 and NGC 6940 to search for the origin of the X-rays. The photometric variability reported earlier for the blue straggler H209 is not confirmed by our light curves, nor is an indication for variability seen in the spectra; thus its X-rays remain unexplained. The X-rays of VR111 and VR114 are likely not a result of magnetic activity as these stars lack strong Ca II H&K emission, while in VR108 the level of activity could be enhanced. The short-period binary H313 is a photometric variable; this supports the interpretation that it is a magnetically active binary. From the detection of the Li I 6707.8Å line, we classify the giant in VR84 as a first-ascent giant; this leaves its circular orbit unexplained. As a side-result we report the detection of Li I 6707.8Å in the spectrum of the giant H3 and the absence of this line in the spectrum of the giant H11; this classifies H3 as a first-ascent giant and H11 as a core-helium-burning clump star, and confirms the faint extension of the red-giant clump in NGC 752.

Abstract Copyright:

Journal keyword(s): stars: activity - stars: blue stragglers - stars: variables: general - open clusters and associations: individual: NGC 752, NGC 6940 - X-rays: stars

Simbad objects: 29

goto Full paper

goto View the reference in ADS

Number of rows : 29

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 BD+37 408 * 01 55 15.2930974729 +37 50 31.301202354   10.41 9.47     K0III 22 0
2 BD+37 409 * 01 55 27.6708211419 +37 59 55.244365029   10.18 9.24     K0III 18 0
3 NGC 752 156 * 01 57 10.5473261116 +37 27 26.550462903   14.64 13.77     ~ 8 0
4 NGC 752 182 ** 01 57 22.272000 +37 36 23.16204   12.82 12.23 12.17   ~ 10 0
5 BD+37 431 SB* 01 57 36.2116385405 +37 45 10.154947116   10.16 9.85     F2III 41 0
6 BD+36 367 V* 01 57 37.3493759767 +37 29 27.618186959   9.80 9.75     A0III 41 0
7 NGC 752 214 * 01 57 39.4453285413 +37 52 25.934516041   10.82 10.44     F2V 18 0
8 NGC 752 OpC 01 57 41 +37 47.1           ~ 537 0
9 V* QX And EB* 01 57 57.7817802186 +37 48 22.450045733   11.91 11.43 11.23   F5 91 0
10 V* V447 And RS* 01 58 53.9321837118 +37 34 42.526336995   14.22 13.39     ~ 9 0
11 NGC 2682 24 SB* 08 50 53.1652747575 +11 47 34.211328214 13.922 13.91 13.307 13.199 12.593 ~ 21 0
12 NGC 2682 51 SB* 08 51 01.5485753883 +11 49 34.338614544 13.485 13.22 12.57 12.54 11.976 G0IV 22 0
13 Cl* NGC 2682 SAND 1082 Al* 08 51 20.7915 +11 53 26.168   11.66 11.150 11.09 10.722 F5IV 114 0
14 Cl* NGC 2682 SAND 1113 RS* 08 51 25.3043713158 +12 02 56.495404774 15.299 14.78 13.736     ~ 42 0
15 NGC 2682 241 * 08 51 49.1422058456 +11 49 43.604520202 13.385 13.31 12.759   12.025 F8IV 32 0
16 NGC 2682 244 RG* 08 51 50.2027768749 +11 46 06.919492376   11.72 10.700   9.820 G8III 72 0
17 IC 4651 OpC 17 24 49 -49 56.0           ~ 309 0
18 * omi Aql PM* 19 51 01.6437560393 +10 24 56.595177367   5.66   4.8   F8V 423 0
19 NGC 6940 84 SB* 20 34 13.5740361160 +28 14 28.144190282   11.3 10.6     F4III 12 0
20 NGC 6940 92 SB* 20 34 18.0897275655 +28 27 30.750960750   12.96 11.80     G8 9 0
21 HD 334747 SB* 20 34 22.9215716392 +28 21 41.370615371   10.92 10.24     F8 15 0
22 NGC 6940 108 * 20 34 25.6782145644 +28 13 41.612060996   12.23 11.19     F0V 14 0
23 NGC 6940 OpC 20 34 26 +28 17.0   6.98 6.3     ~ 157 0
24 NGC 6940 111 SB* 20 34 26.9617518270 +28 22 41.943692286   12.61 11.53     G5 9 0
25 NGC 6940 114 * 20 34 28.5331905402 +28 28 43.893777000   12.31 11.17     G8III 4 0
26 NGC 6940 152 * 20 34 56.6373687754 +28 14 27.138278738   11.92 10.83     K0III 11 0
27 BD+28 4211 HS* 21 51 11.0220905905 +28 51 50.366090892 8.922 10.25 10.58 10.656 10.831 sdO2VIIIHe5 735 0
28 * 35 Peg PM* 22 27 51.5223252490 +04 41 44.391554789 6.74 5.86 4.80 4.02 3.46 K1-III-IV 253 0
29 NGC 7789 OpC 23 57 24 +56 42.5   7.68 6.7     ~ 455 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2001A&A...375..387V and select 'bookmark this link' or equivalent in the popup menu


2020.07.13-23:04:01

© Université de Strasbourg/CNRS

    • Contact