2019AJ....157...63K

Query : 2019AJ....157...63K

2019AJ....157...63K - Astron. J., 157, 63-63 (2019/February-0)

Radii of 88 M subdwarfs and updated radius relations for low-metallicity M-dwarf stars.

KESSELI A.Y., KIRKPATRICK J.D., FAJARDO-ACOSTA S.B., PENNY M.T., GAUDI B.S., VEYETTE M., BOESHAAR P.C., HENDERSON C.B., CUSHING M.C., CALCHI-NOVATI S., SHVARTZVALD Y. and MUIRHEAD P.S.

Abstract (from CDS):

M subdwarfs are low-metallicity M dwarfs that typically inhabit the halo population of the Galaxy. Metallicity controls the opacity of stellar atmospheres; in metal-poor stars, hydrostatic equilibrium is reached at a smaller radius, leading to smaller radii for a given effective temperature. We compile a sample of 88 stars that span spectral classes K7 to M6 and include stars with metallicity classes from solar-metallicity dwarf stars to the lowest metallicity ultra subdwarfs to test how metallicity changes the stellar radius. We fit models to Palomar Double Spectrograph (DBSP) optical spectra to derive effective temperatures (Teff) and we measure bolometric luminosities (Lbol) by combining broad wavelength-coverage photometry with Gaia parallaxes. Radii are then computed by combining the Teff and Lbol using the Stefan-Boltzman law. We find that for a given temperature, ultra subdwarfs can be as much as five times smaller than their solar-metallicity counterparts. We present color-radius and color-surface brightness relations that extend down to [Fe/H] of -2.0 dex, in order to aid the radius determination of M subdwarfs, which will be especially important for the WFIRST exoplanetary microlensing survey.

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

Journal keyword(s): stars: abundances - stars: fundamental parameters - stars: low-mass - subdwarfs

VizieR on-line data: <Available at CDS (J/AJ/157/63): table2.dat table3.dat>

Simbad objects: 93

goto Full paper

goto View the references in ADS

Number of rows : 93
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 G 30-48 PM* 00 09 16.4654974226 +09 00 41.989822734   15.12   12.9   esdK7 30 0
2 LP 524-26 PM* 00 11 00.7854310306 +04 20 25.128660500   19.6   17.0   usdM4 15 0
3 LSR J0020+5526 PM* 00 20 08.1514406362 +55 26 32.642920051   18.1   15.4   sdM2 6 0
4 LP 645-78 LM* 00 25 51.2094370930 -07 48 07.975884728           sdM6 20 0
5 LP 350-34 LM* 00 55 44.2810355629 +25 06 23.579276567   20.6   17.8   sdM6 18 0
6 LP 466-156 PM* 00 59 16.3076584704 +13 51 36.082645200   16.7 14.65 13.77 12.52 dM4 8 0
7 LP 406-47 LM* 01 00 24.6980442392 +17 11 27.730221892   19.1   16.2   esdM3 19 0
8 Wolf 47 Er* 01 03 19.8350070578 +62 21 55.837228636   15.34 13.21 12.4   M5V 202 0
9 LP 467-16 LM* 01 11 25.422648 +15 26 21.51204   16.19 14.43 14.07 11.03 M5.93 85 0
10 Wolf 110 LM* 02 02 52.1477540612 +05 42 20.954967701   13.69   11.845   d/sdM0 61 0
11 G 4-29 LM* 02 34 12.4531586738 +17 45 50.514094508   16.590 14.911 13.852 12.612 sdM3 30 0
12 LP 245-62 PM* 02 38 52.3905288835 +36 17 31.090000621   19.1 18.03 16.6   usdM3 7 0
13 V* VX Ari Er* 02 44 15.5097410539 +25 31 24.114854200 13.363 12.141 10.563 9.49 8.115 dM3 221 0
14 LP 354-264 PM* 02 51 14.6890253116 +24 42 47.092048004   17.0   15.3   usdK7 9 0
15 G 76-39 LM* 02 52 45.5137961739 +01 55 50.574033985   16.27 14.73 13.5 12.73 esdM2 35 0
16 NAME Teegarden's Star LM* 02 53 00.8917932409 +16 52 52.632190137   17.21   14.1   dM6 158 0
17 Wolf 1324 PM* 03 16 26.8160518227 +38 05 55.930213519           esdK7 55 0
18 Ross 34 LM* 03 28 53.1411558437 +37 22 56.808690977   12.43 11.11 10.54   esdK7 70 0
19 BD-12 662 PM* 03 29 19.7918590731 -11 40 42.125381784 12.692 11.415 9.991 9.116 8.287 dK7 61 0
20 Ross 585 PM* 03 30 44.8190409266 +34 01 07.190996589   14.0   12.26   sdM0 39 0
21 Ross 578 LM* 03 38 15.6979940371 -11 29 13.505034257   14.67 13.02     d/sdM2 63 0
22 Wolf 1057 LM* 03 42 29.4197307870 +12 31 33.525352939   14.46 12.841 12.466   d/sdM1 43 0
23 G 95-59 LM* 03 50 13.88544 +43 25 40.6416       13.34   usdM0 38 0
24 LP 357-150 PM* 04 05 28.7340651132 +22 29 29.873893364   20.3   18.4   usdM6 10 0
25 LP 415-315 PM* 04 40 14.5225278759 +15 38 51.819213675   20.7   16.7   usdM2 18 0
26 G 8-57 PM* 04 48 32.2092539225 +22 06 24.987228985   15.8   13.0   esdK7 10 0
27 LP 417-42 LM* 05 10 39.0753733822 +19 24 07.020164855   19.9   17.4   esdM6 38 0
28 LP 417-44 LM* 05 19 56.7070593613 +20 10 52.585080720   21.4   17.8   usdM5 19 0
29 LP 251-35 PM* 05 22 05.3054016777 +38 14 14.639997333   16.6 16.25 14.6   usdM3 18 0
30 LP 33-487 PM* 06 09 57.8689300306 +69 54 46.064607677   21.0   18.4   usdM6 14 1
31 HD 42581 Er* 06 10 34.6149358167 -21 51 52.656352926 10.801 9.607 8.125 7.164 6.121 M1V 480 0
32 LSR J0621+3652 PM* 06 21 31.6046915722 +36 52 57.253729753   16.0   14.9 13.4 usdK7 8 0
33 LSR J0621+1219 PM* 06 21 34.4919566294 +12 19 43.689618184   19.6   16.9   usdM6 7 0
34 LP 34-61 PM* 06 42 05.7752437936 +69 36 46.715063958   17.5   15.9   usdM1 7 0
35 LSR J0705+0506 PM* 07 05 48.7628818144 +05 06 17.120776093   18.4   14.1   sdM4 9 0
36 WISE J070720.48+170533.0 PM* 07 07 19.6131983608 +17 05 46.460652715   17.9   15.46 14.97 usdM2 8 0
37 LP 364-180 PM* 07 16 27.7009993847 +23 42 10.470584335   16.4   14.4   sdM2 19 0
38 BD+33 1505 PM* 07 19 31.2746924218 +32 49 48.339033877   10.58   9.513   M0V 97 0
39 LP 424-21 PM* 08 14 33.5294483700 +15 01 07.772338792   17.5   15.6   esdM1 9 0
40 LSR J0822+1700 LM* 08 22 33.7512747281 +17 00 18.928058113       18.7   usdM7.5 17 0
41 LP 258-28 LM* 08 30 51.6486798422 +36 12 56.809731850   19.7   16.6   esdM6 18 0
42 LP 426-22 PM* 08 52 11.2639490269 +15 30 13.744823817   19.2   17.1   sdM5 11 0
43 LP 486-42 LM* 09 03 08.0511969973 +08 42 43.737487790   18.8   16.8   esdM5.5 16 0
44 Ross 90 PM* 09 38 17.5225372255 +22 00 43.667499128   14.8   13.3   sdM1 19 0
45 L 750-42 LM* 09 43 46.1634765195 -17 47 06.290765826   14.8 13.167 12.693   sdM3 40 0
46 V* AD Leo Er* 10 19 36.2808181226 +19 52 12.010446571   10.82 9.52 9.19   dM3 1340 1
47 BD+01 2447 PM* 10 28 55.5512830314 +00 50 27.598904576 12.389 11.151 9.650 8.617 7.389 dM2 311 0
48 Wolf 358 BY* 10 50 52.0312380389 +06 48 29.259617410 14.532 13.319 11.675 10.459 8.889 M4V 264 0
49 LP 373-25 PM* 10 54 25.8988840281 +24 06 44.475571201   17.7   15.0   esdM2 10 0
50 Wolf 359 Er* 10 56 28.9208702274 +07 00 53.003285286 16.706 15.541 13.507 11.684 9.507 dM6 722 0
51 HD 95735 Er* 11 03 20.1948195942 +35 58 11.576182057 10.030 8.960 7.520 5.99 4.79 M2+V 718 0
52 LP 264-8 LM* 11 08 10.3326899814 +36 30 23.101085136   18.4   16.2   usdM0 12 0
53 G 253-50 PM* 11 25 29.4213077777 +78 15 56.171147188       11.72   d/sdM4 32 0
54 Ross 451 LM* 11 40 20.3051170434 +67 15 32.363188342   12.291   11.2   esdM0 65 0
55 Ross 905 PM* 11 42 11.0933350978 +26 42 23.650782778   12.06 10.613 10.272 8.24 M3V 648 1
56 Ross 128 Er* 11 47 44.3972681420 +00 48 16.400337591 14.223 12.905 11.153 9.859 8.184 dM4 423 0
57 LP 319-53 LM* 11 56 54.8694730566 +26 39 56.429961383   16.6 15.51 14.8 13.00 esdM1 24 0
58 LP 434-29 PM* 12 02 32.2935883106 +16 45 35.303287505   20.3   18.0   usdM5 11 0
59 LP 320-434 PM* 12 21 32.8386023608 +28 54 22.771358991   18.0   15.8   M6Ve 20 0
60 LP 675-8 LM* 12 24 26.8094778949 -04 43 36.762729064   16.542 14.934 13.985 13.052 esdM3 19 0
61 G 149-33 PM* 13 03 34.8329898075 +23 28 46.880664219   17.29   15.5   sdM4 18 0
62 LP 379-49 LM* 13 31 28.2566163684 +24 47 10.894331967   20.9   19.1   sdM6 14 0
63 LSPM J1340+1902 LM* 13 40 40.6973914707 +19 02 22.142738972   19.8   16.9   esdM4 8 0
64 LP 558-40 PM* 13 46 55.5342399927 +05 42 56.454350227   16.4 15.223 14.290 13.410 esdM0 18 0
65 LP 559-21 PM* 14 01 13.7583242149 +07 38 08.813703778   17.6   15.6   esdM0 9 0
66 L 691-74 PM* 14 02 46.6714898270 -24 31 49.721534361   14 12.15 11.722   sdM2 37 0
67 G 165-47 LM* 14 06 55.5867880692 +38 36 56.042385139   16.24   13.7   usdM1 45 0
68 LP 857-48 LM* 14 31 38.2541364240 -25 25 32.848624058   16.8 15.68     esdM4 30 0
69 LP 440-52 LM* 14 39 00.3086540071 +18 39 38.710151529   19.6 18.39 17.3 14.64 sdM7 64 0
70 LP 384-16 PM* 15 35 11.7431829400 +26 03 14.075194546   19.2   17.0   usdM4 8 0
71 LP 225-22 PM* 16 24 33.8352249965 +39 51 48.924376786   19.3   17.1   d/sdM1 16 0
72 G 19-7 Er* 16 57 05.7362228328 -04 20 56.318033870   13.92 12.25 10.99 9.432 dM4 102 0
73 LP 226-32 PM* 17 04 25.5967785141 +39 03 23.967984971   18.7   16.7   esdM3 9 0
74 G 181-33 Pe* 17 15 46.6312843002 +30 37 57.515339727   15.88   14.2   esdK7 14 0
75 LP 139-14 LM* 17 39 51.3970111318 +51 27 17.487299633   19.4   16.9   usdM4 30 0
76 LP 24-219 LM* 18 21 52.9573065588 +77 09 30.023517736   18.0   15.9   usdM3 30 0
77 LP 181-51 PM* 18 29 07.8085460932 +50 32 59.016094585   20.1   17.3   sdM5 17 0
78 LP 141-1 LM* 18 45 52.2450125367 +52 27 40.624600956   16.72 14.96 14.67   d/sdM4 46 0
79 LSPM J1918+1728 PM* 19 18 37.0018602253 +17 28 00.360757467   20.2   17.7   esdM3.0 5 0
80 LSPM J1956+4428 PM* 19 56 17.4564211145 +44 28 46.485710195   17.3   15.0   usdM0 8 0
81 Wolf 1130 Er* 20 05 02.1950576493 +54 26 03.234326252   11.970 13.883     sdM1 140 0
82 LP 515-3 LM* 20 19 04.5756924481 +12 35 04.034862267   16.5   14.8   usdM0 29 0
83 LP 871-18 PM* 20 29 21.9863266698 -23 41 33.499054985   19.5 17.93     usdM2 11 0
84 LP 872-39 PM* 21 05 14.0334828762 -24 46 51.958874913   18.8 17.829 16.402 14.856 d/sdM5 12 0
85 LSR J2115+3804 PM* 21 15 31.6212168729 +38 04 39.809234703   16.8   15.53   usdK7 10 0
86 LSPM J2122+3656 LM* 21 22 56.3508758673 +36 56 00.287604078   18.7   16.0   esdM5 11 0
87 LP 758-60 LM* 21 55 47.9570859391 -11 21 42.774681998     17.40     esdM5 25 0
88 GAT 1385 PM* 22 05 47.0618056870 +53 53 44.747508223   17.2   15.1   usdM1 13 0
89 L 716-108 LM* 22 20 26.9741373768 -24 21 49.524416279   14.0       sdK7 15 0
90 Wolf 1037 LM* 22 28 49.0327130449 +05 48 14.032570122   15.63   13.77   usdK7 35 0
91 V* BR Psc BY* 23 49 12.5250852078 +02 24 04.405476893 11.532 10.427 8.993 8.029 6.946 dM1 327 0
92 LP 463-65 PM* 23 51 18.5990035564 +21 01 09.017889335   20.0   16.6   usdM4 9 0
93 NAME Galactic Bulge reg ~ ~           ~ 4305 0

To bookmark this query, right click on this link: simbad:objects in 2019AJ....157...63K and select 'bookmark this link' or equivalent in the popup menu