1996A&AS..115...41C

Query : 1996A&AS..115...41C

1996A&AS..115...41C - Astron. Astrophys., Suppl. Ser., 115, 41-57 (1996/January-0)

Photometric and spectroscopic studies of cool stars discovered in EXOSAT X-ray images. III. Photometric properties.

CUTISPOTO G., TAGLIAFERRI G., PALLAVICINI R., PASQUINI L. and RODONO M.

Abstract (from CDS):

We present high-precision UBV(RI)c photometry for a sample of active stars detected serendipitously by the EXOSAT satellite. Fourteen objects, out of 47 likely optical counterparts, turned out to be clearly variable, with periods in the range 1-8 days, including a newly discovered eclipsing binary. For most of them the optical variability is consistent with the presence of photospheric cool spots. We have used our multicolour photometry to estimate spectral classifications and distances. The derived distances indicate that some of the observed stars are previously unidentified nearby (d≤25pc) M dwarfs. When combined with the results of high resolution spectroscopy, our photometric observations allow us to investigate the stellar content of the selected X-ray sample. Young stars and RS CVn-type binaries appear to constitute a large fraction of the selected sample.

Abstract Copyright: ∼

Journal keyword(s): stars: activity - stars: late-type - stars: variables - X-ray: stars

VizieR on-line data: <Available at CDS (J/A+AS/115/41): table2 table3>

Simbad objects: 49

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Number of rows : 49
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 HD 987 PM* 00 13 53.0108292528 -74 41 17.850099516   9.48 8.724   7.933 G8V 122 0
2 2MASS J00150240-7250326 SB* 00 15 02.3404604760 -72 50 32.799012648     12.7     M1 24 0
3 V* BZ Scl RS* 01 11 43.1691074664 -25 57 30.156005520   10.32 9.68 9.47 9.16 K0III+(G) 27 0
4 V* BG Psc RS* 01 37 08.8402135080 +20 42 00.459061200   9.38 8.69     G5 35 0
5 UCAC4 483-002642 PM* 01 49 04.4244057408 +06 24 36.896268996   14.60 13.15 12.79   ~ 4 0
6 V* BO Psc BY* 01 49 06.5725675272 +06 24 03.620475828   14.24 12.79 12.354   M2V 12 0
7 EXO 0235.2-5216 PM* 02 36 51.7013280528 -52 03 03.600913140   13.59 12.411   9.727 M2Ve 77 0
8 BD-00 431 RS* 02 47 26.9130062184 -00 12 22.464084672   10.440 9.681 9.813 8.614 G5 50 0
9 V* XX Ari a2* 03 19 47.7617795736 +19 04 34.503922488   7.36 7.41     A0 43 0
10 HD 22670 Er* 03 39 04.4575381464 +09 39 10.236089700   9.69 9.03     G 40 0
11 EXO 040830-7134.7 LM* 04 08 07.0985990664 -71 27 00.851999688           M0 30 0
12 HG 7-232 BY* 04 28 28.776432 +17 41 45.39120   13.58 12.12 11.88   M0.5Ve 69 0
13 HD 293857 PM* 05 11 09.6816397128 -04 10 55.201898028   10.00 9.24     G0 32 0
14 HD 34179 * 05 15 21.6976272336 +00 03 37.186750512   7.98 8.02     B8Ib/II 40 0
15 V* AF Lep RS* 05 27 04.7633281608 -11 54 03.466002240   6.832 6.295     F8V(n)k: 285 0
16 V* UX Col RS* 05 28 56.518320 -33 28 15.46824   11.62 10.59 10.26 9.312 K3Ve 37 0
17 RX J0529.7-3239 LM* 05 29 44.6865885384 -32 39 14.295655764   15.369 13.740 13.560 10.80 M4.5Ve 26 0
18 V* V1321 Ori Or* 05 35 04.3009445808 -05 08 12.737523192   11.94 10.538   9.117 K0III 103 0
19 HD 40216 * 05 55 43.1621436480 -38 06 16.259593752   7.95 7.47     F7V 70 1
20 V* TY Col RS* 05 57 50.7964287096 -38 04 03.139716828   10.28 9.595   8.765 G6V(e) 43 0
21 IRAS 06355-7535 mul 06 33 47.0 -75 37 46           ~ 3 0
22 HD 62323 ** 07 43 31.1100475080 +03 29 08.984802516   7.534 7.021     F8V 48 0
23 RX J0850.8+1217 X 08 50 48.9 +12 17 17     12.9     ~ 6 0
24 BD+20 2233 PM* 08 54 00.5026177848 +20 13 49.427873688   9.08 8.61     F7V 29 0
25 HD 78423 * 09 07 47.9765318424 -09 51 13.247205876   7.85 7.83     A0V 15 0
26 HD 99279 ** 11 24 40.3 -61 38 51           ~ 82 0
27 HD 99279A PM* 11 24 40.3862287109 -61 38 51.311865498   8.769 7.54 7.62 8.86 K5-V 83 0
28 V* V858 Cen EB? 11 36 16.2244550592 -38 02 11.391821304   11.33 10.45   9.519 ~ 20 0
29 RX J1221.7+0156 LM* 12 21 46.4393630232 +01 56 35.999592576   14.23 12.88 12.59   K7e 11 0
30 StKM 1-1021 Er* 12 32 26.3243949216 +20 23 27.574480572   14.46 13.009 12.513   M2.5V 32 0
31 Wolf 468 PM* 13 02 05.8443917784 +12 22 21.449642268   13.9 12.748 12.406   M3Ve 28 0
32 V* IN Vir RS* 13 24 24.1561749744 -02 18 54.937707948   10.33 9.131   7.900 K2III 73 0
33 HD 117860 PM* 13 33 11.3140750320 -08 26 36.051691992   8.00 7.36     G2V 75 0
34 1RXS J161804.9+061702 PM* 16 18 04.9283262840 +06 17 11.078126160   14.332 12.718 12.448   M3.0Ve 20 0
35 HD 147633 ** 16 25 17.58322 -49 08 52.3567   9.44 8.92 8.27   G2V 65 0
36 V* V991 Sco RS* 17 06 29.1105700728 -37 49 26.891100300   10.37 9.693   8.867 G6/8 32 0
37 V* V1017 Sco RS* 17 30 30.6576913272 -34 32 20.579090244   9.14 7.985   6.734 A2V 32 0
38 HD 159808 ** 17 38 46.31253 -44 06 01.1099   8.99 8.99 8.58   F5V 24 0
39 HD 168585 * 18 21 10.3542509856 -16 00 21.295368504   9.47 9.28 9.16 9.186 B7/8II 23 0
40 BD-16 4832 Y*O 18 21 25.9233687240 -16 01 17.955176520 9.5 10.14 9.88 10.04   OB- 10 0
41 HD 170196 * 18 32 52.9954896888 -65 15 41.736353292   7.78 7.81     B9III 15 0
42 BD+01 3828 ** 18 57 19.71216 +01 20 35.1924           G5V 13 0
43 EXO 204152-3129.3 Er* 20 44 57 -31 18.4           M3Ve 2 0
44 EXO 220543-4725.5 Er* 22 08 51 -47 10.8           K4V 2 0
45 Wolf 1561 ** 22 17 18.96 -08 48 12.3           M4V+M5V 18 0
46 HD 218515 V* 23 08 34.8186232848 +04 40 40.832644692   7.66 7.63     B9IV/V 15 0
47 V* V395 Peg RS* 23 20 23.1508674672 +16 47 23.420451516   11.72 11.04     G5 9 0
48 HD 220096 Er* 23 21 15.4989573624 -26 59 12.365460132   6.470 5.656     G5IV 93 0
49 EXO 051922-4544.4 * ~ ~           K5Ve 1 0

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