1997A&A...318..215S


Query : 1997A&A...318..215S

1997A&A...318..215S - Astronomy and Astrophysics, volume 318, 215-230 (1997/2-1)

Coronae on solar-like stars.

SCHMITT J.H.M.M.

Abstract (from CDS):

The results of a complete and sensitive X-ray survey of all known stars of spectral type A, F, and G in the immediate solar vicinity with distances less than 13pc are presented. The X-ray data were obtained primarily from the ROSAT all-sky survey (RASS); those program stars not detected in the RASS data, were subsequently studied in the ROSAT pointed observation program. The detection rate among the F stars in the sample is 95%, that of the G stars 83%, the non-detections being due to survey observations. On the other hand, none of the A-stars with spectral type earlier than A7 could be detected even in sensitive pointings. I conclude from this that coronal formation in stars with surface convection zones is universal. The X-ray luminosities range over about four orders of magnitude, and can be well described with a log-normal distribution. Large X-ray outputs are correlated with kinematic age as assessed from space motions. I show the existence of a correlation between the total emitted X-ray surface flux and spectral hardness, such that more luminous objects tend to have larger spectral hardness, thus implying higher coronal temperatures. The mean X-ray surface fluxes span the same range as is observed for various solar coronal features, with a rather well-defined minimum X-ray flux being present; this minimum X-ray surface flux agrees very well with the X-ray surface flux of solar coronal holes. It therefore appears that a coronal hole represents the minimum state of "activity" not only for the Sun but also for other stars. I discuss a few implications of this finding especially with regard to properties of stars in Maunder minima states.

Abstract Copyright:

Journal keyword(s): stars: X-rays - coronae - nearby stars

Simbad objects: 74

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Number of rows : 74
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 * 85 Peg SB* 00 02 10.3487193861 +27 04 54.599101714 6.47 6.42 5.75 5.16 4.73 G5VbFe-2 533 0
2 * zet Tuc PM* 00 20 04.2586334956 -64 52 29.257190108 4.82 4.80 4.23 3.73 3.40 F9.5V 362 0
3 * bet Hyi PM* 00 25 45.07036 -77 15 15.2860 3.52 3.41 2.79 2.28 1.94 G0V 576 0
4 * eta Cas PM* 00 49 06.2945942922 +57 48 54.638239716 4.04 4.02 3.44 2.94 2.58 F9V 617 0
5 * mu. Cas SB* 01 08 16.3029454473 +54 55 12.561201263 5.93 5.86 5.17 4.55 4.13 G5Vb 557 1
6 * nu. Phe PM* 01 15 11.1214282378 -45 31 53.992580679 5.65 5.54 4.96 4.47 4.11 F9VFe+0.4 244 0
7 * tau Cet PM* 01 44 04.0831371922 -15 56 14.927607677 4.43 4.22 3.50 2.88 2.41 G8V 1171 1
8 V* XX Tri RS* 02 03 47.1141597864 +35 35 28.665702672   9.52 8.42     K0III 122 0
9 * del Tri SB* 02 17 03.2303387763 +34 13 27.235383770 5.50 5.48   4.5   G0.5VFe-0.5 382 0
10 HD 14412 PM* 02 18 58.5047816166 -25 56 44.473793228   7.07 6.34     G8V 211 0
11 * kap For PM* 02 22 32.5904688744 -23 49 00.479863128   5.802 5.198   4.51 G0V 257 0
12 * tet Per PM* 02 44 11.9866154103 +49 13 42.414669174 4.62 4.62 4.11 3.67 3.37 F8V 395 0
13 * iot Per PM* 03 09 04.0193012009 +49 36 47.802053343 4.76 4.64   3.7   G0V 524 0
14 * zet01 Ret PM* 03 17 46.1634549490 -62 34 31.152456644 6.24 6.18 5.54 5.00 4.66 G2.5VHdel1 284 0
15 * zet02 Ret ** 03 18 12.8188824117 -62 30 22.904711032   5.814 5.228     G1V 346 0
16 * kap01 Cet BY* 03 19 21.6963205 +03 22 12.715139 5.71 5.52 4.85 4.27 3.91 G5V 848 0
17 * e Eri PM* 03 19 55.6509122226 -43 04 11.215188426 5.20 4.98 4.27 3.65 3.25 G6V 416 1
18 * 58 Eri BY* 04 47 36.2917029384 -16 56 04.040472552   6.14 5.50     G2.5IV-V 400 0
19 * pi.03 Ori PM* 04 49 50.4109057 +06 57 40.588294 3.620 3.630 3.190 2.77 2.51 F6V 550 0
20 * gam Lep PM* 05 44 27.7906169580 -22 26 54.187756254 4.08 4.07 3.60 3.15 2.89 F6V 411 0
21 * chi01 Ori RS* 05 54 22.9829893 +20 16 34.222038 5.08 5.00 4.40 3.90 3.59 G0V 824 0
22 * alf Men PM* 06 10 14.4725823672 -74 45 10.958331816   5.798 5.069     G7V 260 0
23 * alf CMa SB* 06 45 08.91728 -16 42 58.0171 -1.51 -1.46 -1.46 -1.46 -1.43 A0mA1Va 1468 0
24 * alf CMi SB* 07 39 18.11950 +05 13 29.9552 0.82 0.79 0.37 -0.05 -0.28 F5IV-V+DQZ 1819 0
25 HD 68835 * 08 14 31.9695279624 +10 11 17.899875384   8.30 7.29     G5 20 0
26 HD 69830 PM* 08 18 23.9469682407 -12 37 55.817187530   6.74 5.95     G8:V 494 1
27 HD 72673 PM* 08 32 51.4956803280 -31 30 03.064960317   7.17 6.38     K1V 200 0
28 HD 76151 PM* 08 54 17.9470964696 -05 26 04.054298491 6.89 6.67 6.00     G2V 493 0
29 * 11 LMi RS* 09 35 39.5021937366 +35 48 36.477051175 6.560 6.110 5.340 4.79 4.42 G8Va 358 0
30 HD 84117 PM* 09 42 14.4162029298 -23 54 56.042043626   5.47 4.94     F9V 192 0
31 * 36 UMa PM* 10 30 37.5792656400 +55 58 49.939689252       4.5   F8V 312 1
32 * ksi UMa B SB* 11 18 10.8360115405 +31 31 44.821690914   5.41 4.77 4.4   G2V 334 1
33 * ksi UMa A SB* 11 18 10.901164 +31 31 44.97910   4.79 4.25     F8.5:V 307 1
34 * 61 UMa PM* 11 41 03.0162706212 +34 12 05.881605449 6.31 6.08 5.34 4.73 4.38 G8V 590 0
35 HD 102365 PM* 11 46 31.0725331317 -40 30 01.285867174 5.65 5.55 4.88 4.35 3.97 G2V 310 1
36 * bet Leo dS* 11 49 03.57834 +14 34 19.4090 2.30 2.22 2.13 2.08 2.06 A3Va 561 0
37 * bet Vir PM* 11 50 41.7185158616 +01 45 53.001539131 4.26 4.15 3.60 3.13 2.85 F9V 892 0
38 HD 103095 PM* 11 52 58.7673387755 +37 43 07.254113125 7.38 7.20 6.45 5.80 5.35 K1V_Fe-1.5 768 1
39 HD 104304 PM* 12 00 44.4601479291 -10 26 46.067117528 6.76 6.32 5.55     G8IV 225 0
40 * bet CVn ** 12 33 44.5442516547 +41 21 26.921352859 4.91 4.86 4.25 3.73 3.42 G0V 561 0
41 * gam Vir B Pe* 12 41 39.5425844770 -01 26 57.847656959   3.85 3.49     F0mF2V 221 0
42 * gam Vir PM* 12 41 39.6282288151 -01 26 57.854228847 3.07 3.10 2.74 2.45 2.26 F1-F2V 456 0
43 * bet Com PM* 13 11 52.3938268062 +27 52 41.462309460 4.92 4.84 4.25 3.77 3.47 F9.5V 870 0
44 * 61 Vir PM* 13 18 24.3139864471 -18 18 40.297748582 5.710 5.440 4.740     G6.5V 631 1
45 * 70 Vir PM* 13 28 25.8085908881 +13 46 43.638308807 5.930 5.680 4.970 4.37 3.98 G4Va 694 1
46 * eta Boo SB* 13 54 41.07892 +18 23 51.7946 3.440 3.250 2.680 2.24 1.95 G0IV 681 1
47 HD 121384 PM* 13 56 32.9436065448 -54 42 16.783257240   6.78 6.01     G8VCH+0.3CaIwk 94 0
48 * tet Boo PM* 14 25 11.7970287 +51 51 02.676894 4.57 4.56 4.05 3.64 3.39 F7V 358 0
49 * alf Cen A SB* 14 39 36.49400 -60 50 02.3737 0.96 0.72 0.01     G2V 1203 0
50 * ksi Boo A PM* 14 51 23.3884659504 +19 06 01.619801424   5.40 4.675     G7Ve 513 0
51 * i Boo A PM* 15 03 47.2296400706 +47 39 14.318060796   5.72 5.136     F5V 46 0
52 * i Boo B SB* 15 03 47.5145615709 +47 39 16.128926807   6.82 6.004     G9: 54 1
53 HD 138441 * 15 31 39.4234233672 +14 15 34.636059036   8.82 7.70     G5 20 0
54 * lam Ser PM* 15 46 26.6142121632 +07 21 11.047378824 5.13 5.03 4.42 3.92 3.60 G0-V 552 0
55 * bet TrA PM* 15 55 08.5620636 -63 25 50.615531 3.19 3.14 2.85 2.53 2.38 F1V 156 0
56 * gam Ser PM* 15 56 27.1826948 +15 39 41.820500 4.31 4.34 3.84 3.37 3.13 F6V 545 0
57 HD 144579 PM* 16 04 56.7936202756 +39 09 23.434584550 7.60 7.40 6.67 6.04 5.63 G8V 262 1
58 HD 147513 PM* 16 24 01.2911377368 -39 11 34.729913940 6.17 6.02 5.376     G5V 326 1
59 * zet TrA SB* 16 28 28.1422653048 -70 05 03.824909916   5.446 4.899     F9V 191 0
60 * zet Her SB* 16 41 17.16104 +31 36 09.7873 3.640 3.430 2.800 2.31 1.99 G0IV 533 0
61 * zet Her B * 16 41 17.585592 +31 36 07.31484   6.11 5.31     K0V 28 0
62 * 41 Ara PM* 17 19 03.8375517433 -46 38 10.440417011 6.66 6.28 5.48 4.76 4.30 G9V 183 0
63 * mu. Ara PM* 17 44 08.7031414872 -51 50 02.591603160   5.85 5.15     G3IV-V 497 2
64 * mu.01 Her ** 17 46 27.5472960785 +27 43 14.560978925 4.56 4.17 3.42 2.89 2.51 G5IV 675 0
65 * chi Dra SB* 18 21 03.38255 +72 43 58.2518 4.010 4.070 3.580 3.14 2.83 F7V 391 1
66 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0Va 2591 0
67 * sig Dra PM* 19 32 21.5902098601 +69 39 40.235805206 5.860 5.460 4.680 4.04 3.63 K0V 601 0
68 * alf Aql dS* 19 50 46.99855 +08 52 05.9563 1.07 0.98 0.76 0.62 0.49 A7Vn 848 0
69 * del Pav PM* 20 08 43.6088716052 -66 10 55.442769229 4.78 4.32 3.56 2.95 2.61 G8IV 371 0
70 * psi Cap PM* 20 46 05.7326265 -25 16 15.231155   4.538 4.122     F5V 209 0
71 * gam Pav PM* 21 26 26.6049826473 -65 21 58.313057521 4.57 4.70 4.22 3.75 3.45 F9VFe-1.4CH-0.7 394 0
72 * iot Peg SB* 22 07 00.6655101792 +25 20 42.356386464 4.190 4.200 3.770 3.36 3.11 F5V 433 1
73 HD 211415 PM* 22 18 15.6133953371 -53 37 37.466806476   5.98 5.39 6.52   G0V 178 0
74 * alf PsA ** 22 57 39.04625 -29 37 20.0533 1.31 1.25 1.16 1.11 1.09 A4V 1179 3

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2022.05.23-16:33:15

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