2020A&A...639A..63G


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.25CET09:56:00

2020A&A...639A..63G - Astronomy and Astrophysics, volume 639A, 63-63 (2020/7-1)

Active red giants: Close binaries versus single rapid rotators.

GAULME P., JACKIEWICZ J., SPADA F., CHOJNOWSKI D., MOSSER B., McKEEVER J., HEDLUND A., VRARD M., BENBAKOURA M. and DAMIANI C.

Abstract (from CDS):

Oscillating red-giant stars have provided a wealth of asteroseismic information regarding their interiors and evolutionary states, which enables detailed studies of the Milky Way. The objective of this work is to determine what fraction of red-giant stars shows photometric rotational modulation, and understand its origin. One of the underlying questions is the role of close binarity in this population, which relies on the fact that red giants in short-period binary systems (less than 150 days or so) have been observed to display strong rotational modulation. We selected a sample of about 4500 relatively bright red giants observed by Kepler, and show that about 370 of them (∼8%) display rotational modulation. Almost all have oscillation amplitudes below the median of the sample, while 30 of them are not oscillating at all. Of the 85 of these red giants with rotational modulation chosen for follow-up radial-velocity observation and analysis, 34 show clear evidence of spectroscopic binarity. Surprisingly, 26 of the 30 nonoscillators are in this group of binaries. On the contrary, about 85% of the active red giants with detectable oscillations are not part of close binaries. With the help of the stellar masses and evolutionary states computed from the oscillation properties, we shed light on the origin of their activity. It appears that low-mass red-giant branch stars tend to be magnetically inactive, while intermediate-mass ones tend to be highly active. The opposite trends are true for helium-core burning (red clump) stars, whereby the lower-mass clump stars are comparatively more active and the higher-mass ones are less active. In other words, we find that low-mass red-giant branch stars gain angular momentum as they evolve to clump stars, while higher-mass ones lose angular momentum. The trend observed with low-mass stars leads to possible scenarios of planet engulfment or other merging events during the shell-burning phase. Regarding intermediate-mass stars, the rotation periods that we measured are long with respect to theoretical expectations reported in the literature, which reinforces the existence of an unidentified sink of angular momentum after the main sequence. This article establishes strong links between rotational modulation, tidal interactions, (surface) magnetic fields, and oscillation suppression. There is a wealth of physics to be studied in these targets that is not available in the Sun.

Abstract Copyright: © P. Gaulme et al. 2020

Journal keyword(s): binaries: spectroscopic - stars: rotation - stars: oscillations - techniques: radial velocities - techniques: photometric - starspots

VizieR on-line data: <Available at CDS (J/A+A/639/A63): tablec1.dat>

Status at CDS : Tables of objects will be appraised for possible ingestion in SIMBAD.

Simbad objects: 82

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Number of rows : 82

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 2MASS J18443392+4707584 RG* 18 44 33.9327082744 +47 07 58.398947970           ~ 6 0
2 TYC 3544-2531-1 Er* 18 45 34.0319198172 +47 25 53.710298374   12.49 11.29     K1III 7 0
3 ROTSE1 J184706.07+434032.7 cC* 18 47 06.2844706941 +43 40 34.558490700   12.23 11.16   9.958 K1IV 10 0
4 TYC 3548-615-1 * 18 51 30.2450922716 +48 52 32.008306197   13.12 11.74     ~ 4 0
5 2MASS J18565522+4433083 RG* 18 56 55.2311443079 +44 33 08.305078065           G8IV-V 6 0
6 KIC 8936339 RG* 18 57 51.1011971171 +45 16 18.497509433           K1IV 15 0
7 TYC 3123-1974-1 V* 18 58 04.0134632817 +40 22 27.384436087   12.73 11.42   10.006 K0IV-V 4 0
8 BD+40 3541 Er* 18 58 14.0396982205 +40 46 39.855620835   10.29 9.22     K0II 3 0
9 2MASS J18593226+4607271 RG* 18 59 32.2632906561 +46 07 27.083850720   11.71 10.84     G3III 8 0
10 TYC 3132-2036-1 * 19 00 36.7841531029 +43 49 09.461733227   12.83 11.54     G6V 4 0
11 TYC 3124-1827-1 * 19 00 52.4333386634 +40 38 36.118783734   12.34 11.35     K2III 2 0
12 KIC 3216467 Er* 19 02 08.7354868850 +38 21 31.776135481   13.61 11.50     ~ 12 0
13 HD 177526 Er* 19 03 07.7127485268 +42 45 29.662152902   9.47 8.46     G 3 0
14 KIC 3937217 RG* 19 03 12.0625997239 +39 03 06.567759612   12.78 11.75     ~ 15 0
15 KOI-5596 RG* 19 04 24.3877057440 +45 19 09.134164364           G5V 7 0
16 KIC 8547469 RG* 19 04 59.0473401039 +44 38 32.802815921           G9IIIb 16 0
17 BD+39 3634 RG* 19 05 09.1186554510 +39 24 23.978273391   10.16 9.17     K0 11 0
18 BD+37 3335 RG* 19 05 21.9373295573 +38 03 20.560240847   10.45 9.55     G3V 8 0
19 2MASS J19053056+4203223 RG* 19 05 30.5613698890 +42 03 22.316469091           ~ 5 0
20 KIC 6933666 RG* 19 06 35.5662311873 +42 28 10.273691404           ~ 10 0
21 2MASS J19071658+4516279 RG* 19 07 16.5772960788 +45 16 27.897392929           ~ 6 0
22 KIC 7948193 RG* 19 08 15.4019389122 +43 43 59.917964328   12.03 11.05     ~ 12 0
23 KIC 7670419 RG* 19 08 23.0414269481 +43 22 37.620555160   12.58 11.45     ~ 14 0
24 BD+42 3252 RG* 19 08 24.1599735976 +42 38 09.236293369   10.70 9.59     K0 9 0
25 KIC 8085964 Er* 19 08 35.5617528961 +43 55 02.858757303   11.04 10.06     ~ 15 0
26 2MASS J19084996+3856477 RG* 19 08 49.9632672176 +38 56 47.792746229   11.27 10.39     ~ 6 0
27 TYC 3550-356-1 Ro* 19 09 35.7164344369 +49 30 36.323089863   11.97 11.25     K1IIe 6 0
28 KIC 10198347 RG* 19 10 28.1285676231 +47 16 38.571121762   11.52 10.58     ~ 14 0
29 KIC 7671562 RG* 19 10 29.4202992717 +43 19 09.944545393   12.97 11.85     K1IV 18 0
30 KIC 11907579 * 19 11 45.0111151020 +50 16 52.837146794           K1IIe 2 0
31 KIC 7351098 RG* 19 11 45.1956727428 +42 55 16.273875563   12.01 11.24     ~ 12 0
32 KIC 10461323 RG* 19 11 48.7971302945 +47 41 52.399979609   11.20 10.21     ~ 10 0
33 KIC 3432732 RG* 19 12 57.3143483886 +38 34 51.493660171   12.05 10.98     ~ 10 0
34 TYC 3133-2409-1 Ro* 19 13 07.5826600380 +43 24 57.892316064   12.02 11.12     G6V 4 0
35 KIC 6032639 RG* 19 14 14.9548399006 +41 18 43.251914136   11.95 11.42     G6V 10 0
36 2MASS J19155185+4040542 RG* 19 15 51.8554620643 +40 40 54.312741314   11.7 11.2570     G8III 8 0
37 KIC 11554998 * 19 18 06.5274165526 +49 35 12.538279891           K2III 2 0
38 2MASS J19193415+4401310 RG* 19 19 34.1536932738 +44 01 31.024637425           ~ 4 0
39 KIC 8749284 Ro* 19 20 47.5173842370 +44 55 29.967289127           K1IVe 4 0
40 KIC 12157366 Ro* 19 21 08.1202760579 +50 42 46.167204528           K2III 4 0
41 ROTSE1 J192116.23+401912.3 LP* 19 21 16.3858370348 +40 19 12.864217094     12.755   11.597 ~ 4 0
42 KIC 10793890 RG* 19 21 50.6438239571 +48 10 11.601025450   11.03 10.17     ~ 9 0
43 KIC 3339894 RG* 19 23 22.2365097222 +38 26 31.263764419   12.78 11.60     ~ 12 0
44 1RXS J192345.6+511608 RS* 19 23 44.9866294953 +51 16 11.759932578     12.636 12.84 11.446 ~ 13 0
45 KIC 2441154 LP* 19 23 45.0349870830 +37 44 30.500164842   11.84 10.65   9.407 ~ 5 0
46 BD+44 3120 RG* 19 23 46.2602409675 +45 05 22.772694729   10.14 9.16     G9III 7 0
47 BD+36 3541 Er* 19 24 13.4198731302 +36 33 35.724114966   10.70 9.43     K0 3 0
48 2MASS J19241348+3642145 RG* 19 24 13.4793691888 +36 42 14.461303853           ~ 5 0
49 KIC 2852961 LP* 19 26 11.3777698712 +38 03 10.729992063   11.32 10.36   9.321 ~ 13 0
50 TYC 3543-243-1 EB* 19 27 59.2577264047 +46 31 11.377152848   11.84 10.81     ~ 2 0
51 KIC 2305930 RG* 19 28 25.6367317364 +37 41 23.240529614   12.20 11.02     G8IIIb 23 0
52 TYC 3143-1398-1 * 19 30 44.5026277092 +41 33 36.999430071   13.23 12.06     ~ 3 0
53 2MASS J19315759+4622327 LP* 19 31 57.6018383168 +46 22 32.809753823   12.53 11.22   10.149 K1IIe 4 0
54 TYC 3556-2573-1 * 19 33 22.1486474902 +45 38 22.805648194   11.28 10.12     ~ 6 0
55 2MASS J19344508+3847416 RG* 19 34 45.0785799388 +38 47 41.629194279           G4III-IV 7 0
56 TYC 3143-2014-1 EB* 19 37 25.4837939441 +41 46 37.946218058   12.44 11.56     ~ 6 0
57 KIC 9837673 * 19 38 07.5091720034 +46 38 42.596955995           G6IV 3 0
58 ROTSE1 J193835.80+434130.6 cC* 19 38 35.8950942493 +43 41 31.478950148   12.02 11.40   10.506 G0 7 0
59 HAT 199-01691 BY* 19 39 10.0103874880 +40 52 15.139042378   11.34 10.36   9.299 ~ 10 0
60 KIC 3660182 * 19 40 12.7273939938 +38 47 56.259505981           ~ 2 0
61 2MASS J19401962+3831015 RG* 19 40 19.6222001412 +38 31 01.526496702   11.60 10.54     ~ 6 0
62 KOI-3725 EB* 19 40 48.6940432152 +38 31 10.323422275   11.27 10.34   9.327 K0IV-V 17 0
63 KIC 11037219 RG* 19 40 57.0260395740 +48 30 12.216425682   11.15 10.36     ~ 10 0
64 2MASS J19412199+4012020 bL* 19 41 21.9905642711 +40 12 02.081109569   13.88 12.76   11.44 K1II 9 0
65 KIC 12314910 RG* 19 41 48.7930279881 +51 02 08.510115002   13.06 11.60     ~ 11 0
66 2MASS J19432174+5056396 RG* 19 43 21.7448342004 +50 56 39.617088213   11.36 10.36     ~ 4 0
67 KIC 11146520 * 19 43 28.4364962844 +48 46 52.759868235           ~ 2 0
68 KIC 6707805 Ro* 19 44 05.9143296183 +42 09 05.048451334           G8IV-V 4 0
69 2MASS J19453512+4131172 RG* 19 45 35.1238443506 +41 31 17.255687891           ~ 5 0
70 KOI-6187 RG* 19 46 39.6052314147 +44 51 11.108870952           ~ 17 0
71 2MASS J19475490+4032009 RG* 19 47 54.9089785007 +40 32 00.841572323   11.81 10.80     G6V 7 0
72 2MASS J19481664+4807140 RG* 19 48 16.6414978494 +48 07 14.002674470           ~ 5 0
73 2MASS J19485112+4305201 RG* 19 48 51.1304003616 +43 05 20.172648627   11.89 10.80     ~ 4 0
74 BD+43 3390 RG* 19 52 05.5471012645 +43 23 29.167187725   10.58 9.68     G0 5 0
75 TYC 3141-1076-1 Er* 19 52 45.9945911106 +40 43 42.388280110   11.65 10.52     ~ 3 0
76 2MASS J19530632+4631578 LP* 19 53 06.3280842756 +46 31 57.887302265   13.52 11.99   10.479 G6V 3 0
77 TYC 3562-432-1 Ro* 19 53 09.5006988951 +48 24 25.740381250   13.09 11.79     ~ 2 0
78 KOI-6181 LP* 19 55 00.0036222539 +44 34 21.128135309   12.74 11.96   10.551 K1IV 12 0
79 KIC 9240941 RG* 19 57 10.6126147351 +45 37 36.362258581   12.67 11.74     G6V 9 0
80 KIC 10297952 * 19 58 43.5254116557 +47 23 13.176891838           K1IV 2 0
81 HD 190585 EB* 20 03 48.3210976468 +45 36 14.803519667   10.74 9.65     K2 34 0
82 2MASS J20052798+4451187 RG* 20 05 27.9919716761 +44 51 18.895070402   11.51 10.66     ~ 5 0

    Equat.    Gal    SGal    Ecl

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2020.10.25-09:56:01

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