2024A&A...688A...9S

Query : 2024A&A...688A...9S

2024A&A...688A...9S - Astronomy and Astrophysics, volume 688A9 (2024/8-1)

“Forbidden” stars in the eROSITA all-sky survey: X-ray emission from very late-type giants.

SCHMITT J.H.M.M., HUNSCH M., SCHNEIDER P.C., FREUND S., CZESLA S., ROBRADE J. and SCHWOPE A.

Abstract (from CDS):

We present the results of the first X-ray all-sky survey (eRASS1) performed by the eROSITA instrument aboard the Spectrum-Roentgen-Gamma (SRG) mission on X-ray emitting red giants and supergiants. Focusing on stars positioned at high galactic latitudes above 20°, we constructed a complete sample of such objects using the Gaia DR3 catalog and identified a sample 96 stars that appear as bona fide entries in the eRASS1 source catalog. By again restricting the sample to objects nearer than 1300 pc and eliminating all catalog entries that are due to optical contamination, we ended up with a sample of 16 genuine red giant or supergiant X-ray sources, most of which represent new X-ray detections. We present a low signal-to-noise X-ray spectrum of the nearby low-activity giant Arcturus obtained from a pointed observation with the XMM-Newton satellite and give a detailed account of our data analysis. We show that Arcturus-like X-ray emission cannot be the explanation for the X-ray emissions observed by eROSITA and provide a discussion of the possible nature of the detected X-ray sources.

Abstract Copyright: © The Authors 2024

Journal keyword(s): stars: activity - binaries: close - binaries: symbiotic - Hertzsprung-Russell and C-M diagrams

Simbad objects: 91

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Number of rows : 91
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 2MASS J00241513-7204365 LP? 00 24 15.1561527288 -72 04 36.442019856   13.898 11.178   8.671 ~ 10 0
2 V* BQ Tuc LP? 00 53 37.8777353232 -62 52 16.895532324   7.221 5.748     M4III 49 0
3 V* CI Hyi AB* 02 11 48.9069952080 -71 29 02.588123508   10.55 9.32     M5/7(III) 24 0
4 V* TZ Hor LP? 02 25 26.4540522648 -66 29 38.495313888   7.89 6.44     M5III 25 0
5 V* CL Hyi LP* 02 27 46.8387616416 -69 31 26.338318464   8.50 7.28     M6/7 29 0
6 2MASS J02274745-5736472 LP? 02 27 47.4523812072 -57 36 47.210779188   12.71 11.28     ~ 2 0
7 V* Z Eri AB* 02 47 55.9221088152 -12 27 38.321064756 9.83 8.46 6.90     M5III 120 0
8 V* R Hor Mi* 02 53 52.7701013592 -49 53 22.730520228   9.15 8.14     M5-7e 193 0
9 V* DR Eri LP? 02 58 58.4853919344 -13 20 37.397725224   10.32 8.69     M2/3III 10 0
10 V* TW Hor C* 03 12 33.1599109680 -57 19 17.577229512   7.93 5.71 3.78 2.40 C-N5IIIb: 143 0
11 V* BH Eri LP* 03 23 36.4539013608 -19 53 00.978922320   11.97 10.44     M6 8 0
12 V* UU Ret LP* 03 28 46.9102088760 -59 58 36.110444088   10.93 9.36     M3III 18 0
13 V* WX Ret Mi* 03 37 44.5628905584 -55 23 46.670418024   9.870 8.72     M6/7(III) 21 0
14 CD-67 211 LP* 03 47 01.6823806968 -66 46 14.803187232   11.55 10.19     ~ 3 0
15 V* WX Hor Mi* 03 49 35.8198098288 -52 04 47.844936660   8.99 7.56     M5/6III 32 0
16 V* U Men OH* 04 09 35.5833357218 -81 51 17.682061033           M3e 65 0
17 V* U Men A LP* 04 09 35.5833357218 -81 51 17.682061033   11.19 10.02     ~ 2 0
18 CPD-63 323 LP* 04 21 42.4698163056 -63 39 30.219402816   11.63 10.35     ~ 5 0
19 CD-36 1714 LP? 04 25 17.9676966720 -36 12 31.563146088   11.20 9.94     ~ 2 0
20 HD 270961 * 05 02 27.5309850792 -65 09 02.967298668   12.38 11.19 10.66   K5 9 0
21 V* W Ori C* 05 05 23.7190712856 +01 10 39.454639032 16.36 9.52 6.10 3.83 2.35 C-N5 300 0
22 V* RX Lep AB* 05 11 22.8716317615 -11 50 56.713575585 8.37 7.14 5.68     M6III 112 0
23 CD-51 1503 S* 05 27 45.2430261336 -51 10 39.513302832   11.35 9.89     S5,2 12 0
24 HD 37298 LP* 05 32 31.9834599000 -65 49 32.178268380   10.95 9.79     M5/7(III) 11 0
25 V* WX Men LP? 05 34 44.7819577848 -73 44 28.601023056   7.54 5.85     M2/3III 42 0
26 CPD-84 86 S* 05 54 23.3208696744 -84 03 23.308438644   10.96 9.36     S4,4 13 0
27 * alf Ori s*r 05 55 10.30536 +07 24 25.4304 4.38 2.27 0.42 -1.17 -2.45 M1-M2Ia-Iab 1789 0
28 V* SW Pic LP? 06 02 09.3350809800 -60 05 48.589999764   8.00 6.49     M4III 32 0
29 IRAS 06028-4317 LP* 06 04 22.5277030800 -43 17 52.030549896           ~ 5 0
30 V* S Lep AB* 06 05 45.5496784008 -24 11 44.015025408 9.72 8.42 6.82 4.12 1.75 M6+IIIa 109 0
31 2MASS J06265441-7015499 LP* 06 26 54.4075180934 -70 15 49.801610115           ~ 3 0
32 V* AY Dor AB* 06 31 01.1088554976 -66 52 14.473046928   8.67 7.32     M6II/III 27 0
33 2MASS J06390362-7311524 LP* 06 39 03.6071667672 -73 11 52.423410948   13.896 12.305 12.00 9.36 ~ 8 0
34 IRAS 06497-7312 LP* 06 48 40.2221189880 -73 15 34.840832184   11.94 10.23     ~ 5 0
35 BD+32 1528 LP? 07 22 28.2023723496 +32 24 58.839830532   13.35 10.55 10.326   ~ 5 0
36 V* Y Gem Sy* 07 41 08.5237339920 +20 25 44.334137208   10.23 9.09     M8 52 0
37 CPD-77 406 * 08 30 29.1379593840 -77 47 02.398658496   12.020 10.373     ~ 6 0
38 IRAS 08373-8319 LP? 08 32 24.4251094080 -83 30 09.070538940   12.13 10.71     ~ 4 0
39 V* MV Hya LP* 08 41 50.2995978216 -05 36 38.781657036   9.29 7.83     M3/4III 15 0
40 UCAC4 057-006892 * 08 50 11.8465343952 -78 44 23.710721496       11.975   ~ 6 0
41 V* FZ Cnc LP* 08 59 10.7310716472 +18 08 05.501243868 9.62 7.93 6.38     M4.5III 65 0
42 V* RS Cnc S* 09 10 38.7970163421 +30 57 47.291122681 8.65 7.62 5.95 3.06 0.73 M6S 330 0
43 V* IN Hya LP* 09 20 36.6822884904 +00 10 54.139721628   8.287 6.698     M3/4III 54 0
44 V* EH Leo LP* 09 31 06.1509578904 +25 02 49.830346500   9.38 7.86     ~ 17 0
45 HD 84048 * 09 34 53.1692015448 -80 11 37.227234444   11.15 9.37     M1/2 7 0
46 V* R LMi OH* 09 45 34.2840467232 +34 30 42.809054724   9.442 8.443 9.024   M6.5-9e 343 0
47 FBS L 12-19 LP? 09 48 07.4608378200 -00 51 42.940564200     11.9     M6/7 5 0
48 V* V Hya C* 10 51 37.2615873024 -21 15 00.333928044   12.23 6.80 7.42   C-N:6 391 0
49 * 56 Leo LP? 10 56 01.4682688998 +06 11 07.341317877 8.45 7.24 5.78 3.53 1.44 M5.5III: 179 0
50 V* R Crt AB* 11 00 33.8525664720 -18 19 29.582708520   10.33 9.80     M7/8III 222 0
51 V* CO UMa LP* 11 09 19.0795189080 +36 18 33.766391952 8.75 7.25 5.74     M4III 55 1
52 * ome Vir LP* 11 38 27.6074536027 +08 08 03.459408149 8.46 6.93 5.36     M4.5:III 121 0
53 V* WW Crt AB* 11 46 09.9413725440 -24 52 24.527706492   9.03 7.62     M4III 22 0
54 V* V919 Cen AB* 11 48 39.2232025080 -35 59 12.920416044   8.31 7.05     M7III 47 0
55 V* II Hya LP* 11 48 45.0827283219 -26 44 59.200109138 8.38 6.71 5.11     M4+III 107 0
56 V* V335 Hya LP* 12 13 12.9443867928 -34 07 30.997867620   7.92 6.47     M5.5SIII: 57 0
57 V* BK Vir AB* 12 30 21.0136448232 +04 24 59.142255840 9.60 8.82 7.28     M7-III: 159 0
58 V* SV Crv LP* 12 49 47.0279775696 -15 04 44.096102724   8.60 7.08     M5-III 46 0
59 * 40 Com LP* 13 06 22.6020265896 +22 36 58.273099308 8.82 7.22 5.61 3.63 1.84 M5III: 115 0
60 IRAS 13069-2711 * 13 09 37.0524373656 -27 27 25.463815812   12.64 11.11     ~ 3 0
61 V* SW Vir AB* 13 14 04.3830437280 -02 48 25.130666916 9.24 8.52 6.85     M7III: 274 0
62 V* R Hya Mi* 13 29 42.7801586466 -23 16 52.751628992 7.26 6.58 4.97 2.27 -0.15 M6-9e 511 0
63 HD 120832 S* 13 52 01.3564338336 -03 28 48.440861256   11.04 9.56     S4/5 17 0
64 V* TW Cen Mi* 13 57 43.1806720944 -31 04 11.044795944   10.16 9.51 8.55   M6-8Ib-II:e 37 0
65 BD+08 2823 LP? 14 09 59.8941852600 +07 20 33.191609064   10.86 9.29     M5 3 0
66 * 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 2417 1
67 V* V1002 Cen LP* 14 19 44.3448458160 -36 51 29.560983732   8.46 7.32     M5/6III 22 0
68 IRAS 14325-1316 LP? 14 35 18.4214536752 -13 29 14.892819288   12.08 11.34     ~ 5 0
69 IRAS 14367-3149 * 14 39 47.7710752920 -32 02 04.256674404   12.42 10.99     ~ 2 0
70 V* V768 Cen LP* 14 48 38.0463379536 -36 38 04.908691464   7.37 6.01     M5III 41 0
71 V* FY Lib AB* 14 57 46.5477035016 -12 26 15.326281032   8.63 7.23     M5III 62 0
72 CD-31 11924 LP? 15 24 12.4044915312 -31 47 06.617540760   12.15 10.81     ~ 3 0
73 IRAS 15377-1942 LP* 15 40 36.7332325488 -19 52 06.338291016           ~ 6 0
74 IRAS 15417-0819 LP* 15 44 27.6420910128 -08 29 06.977802012   13.31 11.72     ~ 4 0
75 * alf Sco s*r 16 29 24.45970 -26 25 55.2094 4.08 2.75 0.91 -0.64 -1.87 M1.5Iab+B2Vn 786 0
76 V* NO Aps LP* 17 31 27.4666578288 -80 51 32.876056836   7.464 5.856     M3III 38 0
77 * gam Dra * 17 56 36.36988 +51 29 20.0242 5.630 3.760 2.230 1.08 0.23 K5III 581 1
78 * gam Dra B * 17 56 37.4333634371 +51 29 01.546633314           ~ 1 0
79 IRAS 19204-3959 LP? 19 23 50.6592634944 -39 54 04.915216476           ~ 4 0
80 HD 181817 * 19 23 51.0268901544 -42 56 09.739661388   10.22 8.61     M2III 7 0
81 V* S Pav Mi* 19 55 13.9680387696 -59 11 44.333160288   9.25 8.21     M8III 95 0
82 V* NU Pav LP* 20 01 44.7445781273 -59 22 33.226695613 7.97 6.66 5.13     M6III 74 0
83 V* X Pav AB* 20 11 45.8638935384 -59 56 12.809676840   9.69 9.20     M8III 72 1
84 2MASS J20375214-5051515 LP* 20 37 52.1348683032 -50 51 51.558109668   14.133 12.588 12.47 9.99 ~ 6 0
85 HD 199203 LP? 21 21 53.5676444208 -86 27 54.990280368   10.44 8.62     M2/3(III) 8 0
86 V* SX Pav LP* 21 28 44.9254616915 -69 30 19.382609896   6.97 5.62     M5III 49 0
87 HD 204477 * 21 31 00.4148114832 -56 53 05.136376452   9.76 8.22     M4III 6 0
88 * eps Oct LP* 22 20 01.6806230015 -80 26 23.089683198   6.433 5.177     M5III 67 0
89 * pi.01 Gru S* 22 22 44.2083897000 -45 56 52.791160956 10.52 8.62 6.55 3.19 0.52 S5,7: 216 0
90 V* DM Tuc AB* 22 57 05.8561963680 -57 24 04.224759300   8.65 7.43     M8III 34 0
91 * 56 Peg SB* 23 07 06.7418870416 +25 28 05.773861158 7.20 6.06 4.74 3.74 3.07 K0.5II:Ba1CN-2CH-0.5 270 0

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