2019AJ....157..177A

Query : 2019AJ....157..177A

2019AJ....157..177A - Astron. J., 157, 177-177 (2019/May-0)

The evolutionary status of GK subgiants.

ABT H.A.

Abstract (from CDS):

Snowden & Young suggested that the reason why there are GK subgiants is because they are members of binaries, which would bring them above the main sequence in an Hertzsprung-Russell (HR) diagram. They studied a sample of 30 G0-K1 IV stars and were disappointed to find only two to be spectroscopic binaries. With more accurate radial velocities I found seven binaries in their samples of subgiants and control stars; orbital elements are given for those seven. Using Hipparcos parallaxes and SIMBAD data, I found that nearly all of the G0-K1 IV stars fall on the evolutionary tracks by Garardi et al. for Population I stars with masses of 0.9-1.9 M☉ and ages of up to 1010 yr, which are normal parameters for nearby field stars. Therefore there is no problem regarding the existence of GK subgiants.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): binaries: spectroscopic - stars: evolution - stars: late-type

VizieR on-line data: <Available at CDS (J/AJ/157/177): table1.dat table2.dat table3.dat table4.dat>

Simbad objects: 57

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Number of rows : 57
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 HD 2589 PM* 00 30 55.0787717183 +77 01 09.857050884   7.05   5.7   K0IV 77 0
2 * eps And PM* 00 38 33.3474310042 +29 18 42.311618884 5.72 5.25 4.38 3.70 3.19 G7IIIFe-3CH1 286 0
3 HD 8375 SB* 01 23 37.4712559656 +34 14 45.114766152   7.13 6.28 5.8   G8IV 80 0
4 * 24 Per * 02 59 03.6768425424 +35 10 59.271233124 7.460 6.170 4.930     K2III 130 0
5 * 95 Cet ** 03 18 22.4263835016 -00 55 49.034196624           G9IV 121 0
6 * del Eri PM* 03 43 14.9005379551 -09 45 48.210955899 5.13 4.46 3.54 2.82 2.32 K0+IV 651 0
7 HD 26923 PM* 04 15 28.8004060272 +06 11 12.698572488 6.910 6.860   5.9   G0IV 236 0
8 HD 29613 RG* 04 39 19.7106414840 -14 21 33.082104168   6.510 5.463     K0.5IVa 69 0
9 * m Tau ** 05 07 27.0055682766 +18 38 42.179768546 5.79 5.65   4.5   G1V 316 0
10 * nu. Aur * 05 51 29.3694581040 +39 08 54.686085540 6.160 5.090 3.950 3.15 2.59 K0.5IIICN0.5 206 0
11 * chi01 Ori SB* 05 54 22.9829893 +20 16 34.222038 5.08 5.00 4.40 3.90 3.59 G0V 895 0
12 * 6 Lyn PM* 06 30 47.1075901469 +58 09 45.479816893   6.798 5.855 6.95   K0.5IIIbFe0.5 139 1
13 * nu.02 CMa PM* 06 36 41.0376788353 -19 15 21.169452656 5.96 5.011 3.91 3.13 2.61 K1.5III-IVFe1 282 1
14 HD 52711 PM* 07 03 30.4592307736 +29 20 13.493121298 6.57 6.53   5.6   G0V 280 0
15 * iot Gem ** 07 25 43.5956409143 +27 47 53.086950407 5.67 4.83 3.79 3.02 2.52 G9IIIb 222 0
16 * kap Gem ** 07 44 26.8438122013 +24 23 52.787290890 5.19 4.49 3.57 2.86 2.41 G8III-IIIb 308 0
17 * mu.02 Cnc PM* 08 07 45.8562513552 +21 34 54.526814256 6.14 5.93 5.30     G1IVb 238 0
18 * bet Cnc PM* 08 16 30.9209888482 +09 11 07.958245527 6.750 5.000 3.520 2.42 1.62 K4IIIBa0.5: 383 0
19 * 34 Lyn PM* 08 41 01.0699086744 +45 50 02.421127212   6.344 5.359     G8IV 112 0
20 * zet Hya PM* 08 55 23.6261974442 +05 56 44.034757439 4.92 4.10 3.10 2.39 1.90 G8.5III 254 0
21 HD 76291 PM* 08 56 49.9526041968 +45 37 53.925764016   6.843 5.711     K1IV 96 0
22 HD 82734 * 09 33 12.4598609496 -21 06 56.603996244   6.027 5.003     K0III 110 0
23 * d UMa RS* 09 34 28.8594727848 +69 49 49.226541888 5.67 5.34 4.57 3.91 3.50 G5III-IV 315 0
24 * 11 LMi RS* 09 35 39.5021937366 +35 48 36.477051175 6.560 6.110 5.340 4.79 4.42 G8Va 407 0
25 * 33 Sex PM* 10 41 24.1859419344 -01 44 29.371097184   7.145 6.250     G9IV 182 0
26 * psi UMa PM* 11 09 39.8082958358 +44 29 54.555917043 5.27 4.15 3.01 2.18 1.61 K1III 294 0
27 HD 102928 SB* 11 51 02.2295090976 -05 19 59.993484060   6.676 5.622     K0+IIIb: 104 0
28 * 33 Vir PM* 12 46 22.5452871796 +09 32 22.869715907   6.66   5.1   G9 144 0
29 * 41 Com PM* 13 07 10.7299222671 +27 37 29.055438610 8.14 6.22 4.69 3.64 2.83 K5-III 173 0
30 * 57 Vir PM* 13 15 58.7708690051 -19 56 35.161303899   6.25 5.22     K1IV- 100 0
31 * del Boo PM* 15 15 30.1628200572 +33 18 53.392471806 5.12 4.44 3.49 2.76 2.25 G8IIIFe-1 388 0
32 * 37 Lib PM* 15 34 10.7024841438 -10 03 52.317750492 6.48 5.63 4.62 3.85 3.33 K1III-IV 187 0
33 * phi Boo PM* 15 37 49.5980578296 +40 21 12.364824816   6.140 5.254     G7III-IVFe-2 132 0
34 * rho Ser PM* 15 51 15.9092751251 +20 58 40.513558638 8.20 6.32 4.78 3.56 2.71 K4.5III 92 0
35 * phi Ser PM* 15 57 14.5708375584 +14 24 52.132920192   6.677 5.530     K2III+ 120 0
36 HD 145148 PM* 16 09 11.2150771435 +06 22 43.289900623   6.97   5.3   K1.5IV 187 0
37 * zet Her SB* 16 41 17.16104 +31 36 09.7873 3.640 3.430 2.800 2.31 1.99 G0IV 562 0
38 HD 153226 PM* 16 57 32.0397992400 +13 53 02.805447984   7.316 6.361     K0V 61 0
39 * kap Oph LP? 16 57 40.0975028128 +09 22 30.104472450 5.52 4.36 3.20 2.36 1.82 K2III 314 0
40 HD 156846 PM* 17 20 34.3108875144 -19 20 01.491746388 7.20 7.10 6.52     G1V 128 1
41 HD 158614 SB* 17 30 23.79699 -01 03 46.4882 6.34     5.52   G9-IV-VHdel1 307 0
42 * kap Lyr V* 18 19 51.7091048595 +36 03 52.370938421 6.70 5.51 4.34 3.48 2.93 K2-IIIabCN0.5 150 0
43 HD 170811 PM* 18 27 42.1448950296 +59 32 56.806663992 8.130 7.410 6.420     K0IV 29 0
44 HD 170829 SB* 18 30 41.6507921448 +20 48 54.168637788   7.28 6.48 6.0   G8V 89 0
45 HD 170928 * 18 35 09.3398329992 -55 34 57.251279280   9.31 7.64     K5III 14 0
46 HD 171994 PM* 18 37 09.0598217952 +16 11 53.861220348   7.212 6.307     G8IV 52 0
47 HD 176668 * 18 57 17.3396570184 +62 23 48.384284892   7.42 6.49     G6III 40 0
48 * b Aql PM* 19 24 58.1999714302 +11 56 39.888480530 6.35 5.93   4.7   G7IVHdel1 522 0
49 * bet Aql PM* 19 55 18.7928429719 +06 24 24.351242346 5.040 4.560 3.710 3.05 2.56 G8IV 578 0
50 HD 190360 PM* 20 03 37.4050868074 +29 53 48.492435887   6.44   5.2   G7IV-V 490 1
51 * b01 Cyg RS* 20 06 21.7672972921 +35 58 20.889117643   6.21   4.8   G8.5IVa 191 0
52 * kap Del PM* 20 39 07.7867477765 +10 05 10.291671448   5.77   4.6   G2IV 206 0
53 * eta Cep PM* 20 45 17.3751675120 +61 50 19.614231888 4.960 4.320 3.410 2.76 2.27 K0IV 461 0
54 * gam02 Del PM* 20 46 39.4998239664 +16 07 27.458234724   5.26 4.25 4.1   K1IV 192 0
55 * 1 Peg PM* 21 22 05.1994953807 +19 48 16.237518964 6.25 5.20 4.09 3.30 2.76 K1III 190 0
56 * 5 Psc PM* 23 08 40.9095327701 +02 07 40.355833093   6.33 5.43     G6IIIb 103 0
57 * gam Cep SB* 23 39 20.9104133784 +77 37 56.510781384 5.190 4.250   2.6   K1III-IVCN1 626 1

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