1999A&A...348..161P

Query : 1999A&A...348..161P

1999A&A...348..161P - Astronomy and Astrophysics, volume 348161-169 (1999/8-1)

X-ray emission from A0-F6 spectral type stars.

PANZERA M.R., TAGLIAFERRI G., PASINETTI L. and ANTONELLO E.

Abstract (from CDS):

We use the ROSAT public data archive to study the X-ray emission of a sample of supposedly single A0-F6 spectral type stars from the Bright Star Catalogue. We detected X-ray emission from 19 A- and 33 F-type stars. However, our results are not sufficient to associate with certainty the X-ray emission to the A-type stars themselves, since the usual argument that it may originate from a binary companion cannot be excluded. A spectral analysis was conducted for 14 sources (3 A and 11 F), finding that for 12 of them a two temperature thermal plasma model is needed to reproduce the observed spectra. The two temperatures are centered at 0.13 and 0.54keV, respectively. The values found for the higher temperature are lower than that ones of X-ray selected single late-type stars. The X-ray luminosities are in the range LX ∼ 1028-1030erg/s, with a distribution similar to that of active late-type stars. No correlation is found between LX and B-V color, vsini and Lbol, while a positive correlation is found between the X-ray luminosity and the hardness ratio.

Abstract Copyright: ∼

Journal keyword(s): X-rays: stars - stars: coronae - stars: chromospheres - stars: activity - stars: binaries: general

Simbad objects: 56

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Number of rows : 56
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 * bet Cas dS* 00 09 10.68518 +59 08 59.2120 2.73 2.61 2.27 1.97 1.77 F2III 551 0
2 * rho Psc V* 01 26 15.2623962744 +19 10 20.450614692   5.718 5.344     F2V 121 0
3 HD 13456 PM* 02 11 22.2261677208 -10 03 07.779274956   6.398 5.999     F3V 78 0
4 * eta Hor ** 02 37 24.3486279936 -52 32 35.192050404   5.569 5.293     A6V 87 0
5 * 47 Ari PM* 02 58 05.2213070040 +20 40 07.442238720   6.230   5.6   F0V(e) 201 0
6 HD 20888 PM* 03 17 59.0748472584 -66 55 36.667301016   6.163 6.022     A3V 74 0
7 HD 20675 PM* 03 21 52.5329743680 +49 04 15.257802576       5.7   F6V 87 0
8 * alf Per V* 03 24 19.3700924 +49 51 40.245455 2.64 2.27 1.79     F5Ib 870 1
9 * f Eri B PM* 03 48 35.4776869320 -37 37 19.212410172   5.26 5.25     A1Va 40 0
10 HD 24357 PM* 03 53 10.0461915456 +17 19 37.507270260   6.294 5.946 5.745 5.545 F4V 197 0
11 HD 25457 TT* 04 02 36.7442719512 -00 16 08.119921152   5.88 5.38     F7V 293 0
12 * 83 Tau ** 04 30 37.3629243168 +13 43 27.848332992   5.655 5.395 5.245 5.093 F0IV 163 0
13 HD 28736 PM* 04 32 04.8085885704 +05 24 36.148166280   6.783 6.352 6.104 5.874 F5V 188 0
14 V* V1116 Tau dS* 04 36 29.1498376560 +23 20 27.021565644   6.418 6.019     F2 128 0
15 * kap Dor PM* 04 44 21.1783353240 -59 43 57.856305684   5.467 5.282     A8/9III/IV 49 0
16 HD 30321 PM* 04 46 24.1623639696 -02 57 16.300244664   6.361 6.316     A0/1V 47 0
17 HD 31362 * 04 56 15.5776069800 +24 35 31.985894760   6.664 6.324     F0 50 0
18 * nu.02 Col PM* 05 37 44.6176295592 -28 41 22.884909396   5.77 5.31     F5V 110 0
19 * gam Lep PM* 05 44 27.7906169580 -22 26 54.187756254 4.08 4.07 3.60 3.15 2.89 F6V 459 0
20 * del Dor * 05 44 46.3699967519 -65 44 07.793159129 4.69 4.57 4.36 4.10 3.93 A7V 138 0
21 * omi Aur * 05 45 54.0419582136 +49 49 34.575758364   5.495 5.460     A2VpCr 130 0
22 * eta Lep PM* 05 56 24.2934904501 -14 10 03.718335613 4.05 4.05 3.72 3.39 3.23 F2V 352 0
23 * alf Car * 06 23 57.10988 -52 41 44.3810 -0.49 -0.59 -0.74 -0.96 -1.13 A9II 461 1
24 HD 45638 * 06 29 00.1565779104 +11 01 09.300262404 6.890 6.870 6.590     A9IV 52 0
25 HD 45618 PM* 06 44 30.3549214800 +82 06 55.203742728 6.890 6.810 6.630     A5V 41 0
26 * ksi Gem RG* 06 45 17.3644854477 +12 53 44.141855267 3.85 3.79 3.36 2.97 2.74 F5IV-V 233 0
27 * alf Pic PM* 06 48 11.45512 -61 56 29.0008   3.46 3.23     A8VnkA6 182 0
28 * alf Cha PM* 08 18 31.5524679912 -76 55 11.006621351   4.448 4.047     F5VFe-0.8 113 0
29 HD 82380 * 09 33 07.3836837864 +49 26 19.220025912 6.980 6.880 6.780     A4V 30 0
30 HD 87141 * 10 04 36.3224900520 +53 53 30.171961248   6.191 5.708     F5V 131 0
31 * 40 Leo dS* 10 19 44.1672125464 +19 28 15.285966538   5.24   4.5   F6IV-V 288 0
32 * 37 UMa PM* 10 35 09.6937360824 +57 04 57.487315116   5.481 5.148     F2V 194 0
33 * 49 UMa PM* 11 00 50.4171801240 +39 12 43.474839336   5.306 5.062     F0Vs 79 0
34 HD 101688 PM* 11 42 05.1885352176 +22 12 39.793366656 6.940 6.990 6.650     F2IV-V 46 0
35 * 13 Com a2* 12 24 18.5489029728 +26 05 54.921403788   5.26 5.18     A3V 148 0
36 HD 111893 SB* 12 52 27.4988670744 +16 07 20.982598212   6.454 6.285     A7V 62 0
37 HD 116160 PM* 13 21 41.6458462536 +02 05 14.060137272   5.732 5.687   5.64 A0V 79 0
38 HD 117361 PM* 13 28 45.8310369648 +50 43 06.864242700   6.807 6.417     F0IV 54 0
39 HD 118646 PM* 13 38 42.0709958256 -29 33 39.123093744   6.221 5.810     F3V 75 0
40 * iot Vir PM* 14 16 00.8682760805 -06 00 01.969483331 4.64 4.60 4.08     F7III 372 0
41 V* CN Boo dS* 14 16 04.1396967072 +18 54 42.485224608   6.231 5.957     A8V 79 0
42 * 18 Boo PM* 14 19 16.2797193624 +13 00 15.483901068   5.788 5.396     F3V 176 0
43 * tau07 Ser ** 15 41 54.7165814280 +18 27 50.531406696   5.994 5.792   5.61 A8Vam 98 0
44 HD 145100 PM* 16 09 55.2727264152 -18 20 26.259718020   6.838 6.430     F3V 57 0
45 * eta UMi PM* 16 17 30.2702509656 +75 45 19.235082204   5.32   4.7   F5V 91 0
46 * eta Sco PM* 17 12 09.1940948534 -43 14 21.082311424 3.83 3.74 3.33 2.97 2.77 F5IV 158 0
47 HD 157373 PM* 17 20 33.7543461984 +48 11 19.609735200   6.86   6.1   F4V 100 0
48 HD 159312 * 17 35 43.0769582448 -37 26 23.535249540   6.493 6.463     A0V 38 0
49 HD 175938 PM* 18 45 38.1708579288 +79 56 33.639620100 6.710 6.670 6.400     A8V 53 0
50 HD 186185 PM* 19 43 33.5477235951 -15 28 12.076153462   5.95 5.49     F6IV-V 91 0
51 * alf Aql dS* 19 50 46.99855 +08 52 05.9563 1.07 0.98 0.76 0.62 0.49 A7Vn 919 1
52 HD 187753 ** 19 51 17.7280525920 +09 37 47.614321416   6.334 6.233     A1m 53 0
53 HD 197373 PM* 20 40 17.8923782424 +60 30 18.953942688       5.7   F6IV 93 0
54 * alf Cep PM* 21 18 34.77233 +62 35 08.0681 2.770 2.680 2.460 2.22 2.11 A8Vn 374 0
55 UCAC3 306-134002 * 21 18 44.414 +62 37 55.83   13.23 12.39 12.96   ~ 1 0
56 UCAC3 306-134007 * 21 18 44.785 +62 37 55.38       13.13   ~ 1 0

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