1996A&A...310..801H


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.02CET20:14:20

1996A&A...310..801H - Astronomy and Astrophysics, volume 310, 801-812 (1996/6-3)

ROSAT X-ray observations of a complete, volume-limited sample of late-type giants.

HUENSCH M., SCHMITT J.H.M.M., SCHROEDER K.-P. and REIMERS D.

Abstract (from CDS):

We have investigated a complete sample of the nearest 39 late type giants (d≤25pc) for which we have probed the X-ray luminosity function with unprecedented sensitivity by deep (3...18ksec) ROSAT PSPC-observations in the pointed mode, together with ROSAT All-Sky survey (RASS) data. We confirm the X-ray dividing line for luminosity class III giants as proposed by Haisch et al. (1991, 1992) and we find evidence, that essentially all luminosity class III giants with B-V<1.2 or spectral type <K3, that is to the hot side of the X-ray dividing line in the HR diagram, show X-ray emission with typical luminosities of about 1027erg/s. A few stars like β Cet have considerably higher X-ray luminosities. On the right, cool side of the X-ray dividing line, we find only one X-ray emitting star in our sample, while the other stars have upper limits for their ratios of X-ray to bolometric luminosities as low as logLx/Lbol≤-10. We find observational evidence for a minimum X-ray surface flux to the left of the dividing line of the order of ≃100erg/cm2/s, which seems to be independent of B-V colour. The data and their implications for our understanding of coronae of late-type giants, in particular the questions concerning the dividing lines and possible acousting heating of the coronae are discussed in some detail.

Abstract Copyright:

Journal keyword(s): stars: activity - stars: coronae - stars: late-type - X-rays: stars

Simbad objects: 48

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Number of rows : 48

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 * alf Phe SB* 00 26 17.05140 -42 18 21.5539   3.46 2.37     K0.5IIIb 143 0
2 * bet Cet PM* 00 43 35.37090 -17 59 11.7827 3.90 3.02 2.01 1.29 0.78 G9.5IIICH-1 500 0
3 * eta Cet HB* 01 08 35.3914827 -10 10 56.156955 5.80 4.61 3.45 2.61 2.03 K2-IIIb 200 0
4 * bet And PM* 01 09 43.92388 +35 37 14.0075 5.58 3.62 2.05 0.81 -0.19 M0+IIIa 535 0
5 * tet Cet HB* 01 24 01.4052830 -08 10 59.721253 5.57 4.65 3.59 2.83 2.26 K0IIIb 179 0
6 * gam Phe SB* 01 28 21.9272669 -43 19 05.650173   4.98 3.41     M0III 134 0
7 * alf Ari PM* 02 07 10.40570 +23 27 44.7032 4.29 3.17 2.01 1.15 0.54 K2-IIIbCa-1 607 1
8 * bet Ret SB* 03 44 11.9860371304 -64 48 24.778354082   4.968 3.833     K2-IIIb 104 0
9 * alf Tau LP? 04 35 55.23907 +16 30 33.4885 4.32 2.40 0.86 -0.37 -1.31 K5+III 1188 1
10 * alf Aur SB* 05 16 41.35871 +45 59 52.7693 1.33 0.88 0.08 -0.52 -0.96 G3III: 1140 0
11 V* V415 Car Al* 06 49 51.3141446 -53 37 20.818154   5.323 4.408     G4II 69 0
12 * bet Gem PM* 07 45 18.94987 +28 01 34.3160 3.00 2.14 1.14 0.39 -0.11 K0IIIb 1055 1
13 * bet Vol PM* 08 25 44.1947206 -66 08 12.804954   4.896 3.759     K2III 77 0
14 * mu. UMa SB* 10 22 19.7397659 +41 29 58.269105 6.53 4.64 3.05 1.76 0.80 M0III 294 0
15 * eps Mus LP* 12 17 34.2771607 -67 57 38.648630 7.27 5.60 4.02 2.12 0.36 M4III 68 0
16 * eps Vir PM* 13 02 10.5978496 +10 57 32.941443 4.45 3.71 2.79 2.16 1.71 G8III-IIIb 519 0
17 * pi. Hya PM* 14 06 22.2974865 -26 40 56.502378 5.45 4.41 3.28 2.40 1.85 K2-IIIFe-0.5 130 0
18 * tet Cen PM* 14 06 40.94752 -36 22 11.8371 3.94 3.04 2.05 1.29 0.76 K0-IIIb 238 0
19 * alf Boo RG* 14 15 39.67207 +19 10 56.6730 2.46 1.18 -0.05 -1.03 -1.68 K1.5IIIFe-0.5 2151 0
20 * bet UMi V* 14 50 42.32580 +74 09 19.8142 5.32 3.55 2.08 0.97 0.21 K4-III 305 0
21 * sig Lib LP* 15 04 04.2160765 -25 16 55.060636 6.86 4.91 3.21 1.60 0.33 M2.5III 175 0
22 * zet Lup PM* 15 12 17.0959556 -52 05 57.291916 4.99 4.33 3.41     G8III 98 0
23 * iot Dra V* 15 24 55.7746265 +58 57 57.834445 5.68 4.45 3.29 2.51 1.91 K2III 373 1
24 * gam Lib ** 15 35 31.5788082 -14 47 22.327851 5.67 4.93 3.91 3.20 2.65 G8.5III 143 0
25 * ups Lib ** 15 37 01.4501996 -28 08 06.292648   4.979 3.589     K3.5III 87 0
26 * alf Ser PM* 15 44 16.0743159 +06 25 32.263272 5.080 3.800 2.630 1.82 1.25 K2IIIbCN1 496 0
27 * eps Oph PM* 16 18 19.2897431 -04 41 33.034466 4.95 4.21 3.23 2.54 2.05 G9.5IIIbFe-0.5 226 0
28 * gam02 Nor PM* 16 19 50.4222657 -50 09 19.822276 6.27 5.10 4.02 3.24 2.66 K0III 65 1
29 * eta Dra PM* 16 23 59.4906150026 +61 30 51.247636023 4.35 3.65 2.74 2.12 1.66 G8-IIIab 279 0
30 * alf TrA * 16 48 39.89508 -69 01 39.7626   3.36 1.92     K2III_Ba1 229 0
31 * zet Ara * 16 58 37.2121689 -55 59 24.520302   4.701 3.076     K3III 88 0
32 * G Sco * 17 49 51.4808134 -37 02 35.897520 5.57 4.38 3.21     K2III 74 0
33 * gam Dra * 17 56 36.36988 +51 29 20.0242 5.630 3.760 2.230 1.08 0.23 K5III 518 0
34 * eta Sgr LP? 18 17 37.6350518 -36 45 42.066723 6.37 4.67 3.11 1.55 0.23 M2III 133 0
35 * del Sgr * 18 20 59.6435424 -29 49 41.165919   4.069 2.668     K2.5IIIaCN0.5 163 0
36 * eta Ser PM* 18 21 18.6005560 -02 53 55.776595 4.84 4.19 3.25 2.55 2.05 K0III-IV 353 0
37 HD 169689 Al* 18 25 38.7987210726 +08 01 55.231059632   6.545 5.665     G9II+B9V 99 0
38 * lam Sgr PM* 18 27 58.2407185 -25 25 18.114589 4.75 3.85 2.81 2.06 1.50 K1IIIb 260 0
39 * omi Sgr PM* 19 04 40.9817725 -21 44 29.384529 5.63 4.77 3.77 3.05 2.52 G9IIIb 99 0
40 * tau Sgr PM* 19 06 56.4052936935 -27 40 13.609432896 5.65 4.51 3.31 2.44 1.85 K1.5IIIb 145 0
41 * alf Ind PM* 20 37 34.0320077 -47 17 29.402601 4.90 4.11 3.11     K0III-IV 123 0
42 * eps Cyg ** 20 46 12.6823609 +33 58 12.924926 4.370 3.520 2.480 1.73 1.19 K0III 481 0
43 * nu. Oct SB* 21 41 28.5420355132 -77 23 24.031541832   4.745 3.728 5.46   K1III 109 1
44 * lam Peg PM* 22 46 31.8778614 +23 33 56.356140 5.93 5.00 3.93 3.16 2.66 G8IIIaCN0.5 158 0
45 * iot Cep PM* 22 49 40.8169435 +66 12 01.463616 5.50 4.60 3.54 2.69 2.19 K0-III 234 0
46 * mu. Peg PM* 22 50 00.1931506 +24 36 05.698380 5.10 4.42 3.48 2.80 2.33 G8+III 278 0
47 * lam And RS* 23 37 33.8426114 +46 27 29.337984 5.54 4.84 3.82 3.04 2.47 G8IVk 642 0
48 * gam Cep SB* 23 39 20.9015326708 +77 37 56.505477975 5.190 4.250   2.6   K1III-IVCN1 554 1

    Equat.    Gal    SGal    Ecl

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2020.12.02-20:14:20

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