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

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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 - 2026 		#notes
1 G 30-48 PM* 00 09 16.4654974226 +09 00 41.989822734   15.12   12.9   esdK7 31 0
2 LP 524-26 PM* 00 11 00.7854310306 +04 20 25.128660500   19.6   17.0   usdM4 17 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 22 0
5 LP 350-34 LM* 00 55 44.2810355629 +25 06 23.579276567   20.6   17.8   sdM6 22 0
6 LP 466-156 PM* 00 59 16.3076584704 +13 51 36.082645200   16.7 14.65 13.77 12.52 dM4 12 0
7 LP 406-47 LM* 01 00 24.6980442392 +17 11 27.730221892   19.1   16.2   esdM3 21 0
8 Wolf 47 PM* 01 03 19.8350070578 +62 21 55.837228636   15.34 13.21 12.4   M5V 232 0
9 LP 467-16 LM* 01 11 25.422648 +15 26 21.51204   16.19 14.43 14.07 11.03 M5V 94 0
10 Wolf 110 LM* 02 02 52.1477540612 +05 42 20.954967701   13.69   11.845   d/sdM0 65 0
11 G 4-29 LM* 02 34 12.4531586738 +17 45 50.514094508   16.590 14.911 13.852 12.612 sdM3 33 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 PM* 02 44 15.5097410539 +25 31 24.114854200 13.363 12.141 10.563 9.49 8.115 dM3 249 0
14 LP 354-264 PM* 02 51 14.6890253116 +24 42 47.092048004   17.0   15.3   usdK7 10 0
15 G 76-39 LM* 02 52 45.5137961739 +01 55 50.574033985   16.27 14.73 13.5 12.73 esdM2 36 0
16 NAME Teegarden's Star LM* 02 53 00.8917932409 +16 52 52.632190137   17.21 15.14 13.03 10.65 dM6 207 0
17 Wolf 1324 PM* 03 16 26.8160518227 +38 05 55.930213519           esdK7 59 0
18 Ross 34 LM* 03 28 53.1411558437 +37 22 56.808690977   12.43 11.11 10.54   esdK7 75 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 69 0
20 Ross 585 PM* 03 30 44.8190409266 +34 01 07.190996589   14.0   12.26   sdM0 42 0
21 Ross 578 LM* 03 38 15.6979940371 -11 29 13.505034257   14.67 13.02     d/sdM2 65 0
22 Wolf 1057 LM* 03 42 29.4197307870 +12 31 33.525352939   14.46 12.841 12.466   d/sdM1 44 0
23 G 95-59 ** 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 11 0
25 LP 415-315 PM* 04 40 14.5225278759 +15 38 51.819213675   20.7   16.7   usdM2 20 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       14.6   usdM3 21 0
30 LP 33-487 PM* 06 09 57.8689300306 +69 54 46.064607677   21.0   18.4   usdM6 14 1
31 HD 42581 PM* 06 10 34.6149358167 -21 51 52.656352926 10.801 9.607 8.125 7.164 6.121 M1V 544 0
32 LSR J0621+3652 PM* 06 21 31.6046915722 +36 52 57.253729753   16.0   14.9 13.4 usdK7 10 0
33 LSR J0621+1219 PM* 06 21 34.4919566294 +12 19 43.689618184   19.6   16.9   usdM6 9 0
34 LP 34-61 PM* 06 42 05.7752437936 +69 36 46.715063958   17.5   15.9   usdM1 9 0
35 LSR J0705+0506 PM* 07 05 48.7628818144 +05 06 17.120776093   18.4   14.1   sdM4 9 0
36 2MASS J07071961+1705464 PM* 07 07 19.6131983608 +17 05 46.460652715   17.9   15.46 14.97 usdM2 9 0
37 LP 364-180 PM* 07 16 27.7009993847 +23 42 10.470584335   16.4   14.4   sdM2 22 0
38 BD+33 1505 PM* 07 19 31.2746924218 +32 49 48.339033877   10.58   9.513   M0V 109 0
39 LP 424-21 PM* 08 14 33.5294483700 +15 01 07.772338792   17.5   15.6   esdM1 11 0
40 LSR J0822+1700 LM* 08 22 33.7512747281 +17 00 18.928058113       18.7   usdM7.5 18 0
41 LP 258-28 LM* 08 30 51.6486798422 +36 12 56.809731850   19.7   16.6   esdM6 21 0
42 LP 426-22 PM* 08 52 11.2639490269 +15 30 13.744823817   19.2   17.1   sdM5 13 0
43 LP 486-42 LM* 09 03 08.0511969973 +08 42 43.737487790   18.8   16.8   esdM5.5 19 0
44 Ross 90 PM* 09 38 17.5225372255 +22 00 43.667499128   14.8   13.3   sdM1 22 0
45 L 750-42 LM* 09 43 46.1634765195 -17 47 06.290765826   14.8 13.167 12.693   sdM3 45 0
46 V* AD Leo PM* 10 19 36.2808181226 +19 52 12.010446571   10.82 9.52 9.19   dM3 1469 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 361 0
48 Wolf 358 BY* 10 50 52.0312380389 +06 48 29.259617410 14.532 13.319 11.675 10.459 8.889 M4V 298 0
49 LP 373-25 PM* 10 54 25.8988840281 +24 06 44.475571201   17.7   15.0   esdM2 13 0
50 Wolf 359 PM* 10 56 28.9208702274 +07 00 53.003285286 16.706 15.541 13.507 11.684 9.507 dM6 775 0
51 HD 95735 PM* 11 03 20.1948195942 +35 58 11.576182057 10.030 8.960 7.520 5.99 4.79 M2+V 795 0
52 LP 264-8 LM* 11 08 10.3326899814 +36 30 23.101085136   18.4   16.2   usdM0 13 0
53 G 253-50 PM* 11 25 29.4213077777 +78 15 56.171147188       11.72   d/sdM4 37 0
54 Ross 451 LM* 11 40 20.3051170434 +67 15 32.363188342   12.291   11.2   esdM0 70 0
55 Ross 905 PM* 11 42 11.0933350978 +26 42 23.650782778   12.06 10.613 10.272 8.24 M3V 750 1
56 Ross 128 PM* 11 47 44.3972681420 +00 48 16.400337591 14.223 12.905 11.153 9.859 8.184 dM4 484 0
57 LP 319-53 LM* 11 56 54.8694730566 +26 39 56.429961383   16.6 15.51 14.8 13.00 esdM1 26 0
58 LP 434-29 PM* 12 02 32.2935883106 +16 45 35.303287505   20.3   18.0   usdM5 12 0
59 LP 320-434 PM* 12 21 32.8386023608 +28 54 22.771358991   18.0   15.8   M6Ve 24 0
60 LP 675-8 LM* 12 24 26.8094778949 -04 43 36.762729064   16.542 14.934 13.985 13.052 esdM3 20 0
61 G 149-33 PM* 13 03 34.8329898075 +23 28 46.880664219   17.29   15.5   sdM4 23 0
62 LP 379-49 LM* 13 31 28.2566163684 +24 47 10.894331967   20.9   19.1   sdM6 15 0
63 LSPM J1340+1902 LM* 13 40 40.6973914707 +19 02 22.142738972   19.8   16.9   esdM4 9 0
64 LP 558-40 PM* 13 46 55.5342399927 +05 42 56.454350227   16.4 15.223 14.290 13.410 esdM0 20 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 40 0
67 G 165-47 LM* 14 06 55.5867880692 +38 36 56.042385139   16.24   13.7   usdM1 47 0
68 LP 857-48 LM* 14 31 38.2541364240 -25 25 32.848624058   16.8 15.68     esdM4 32 0
69 LP 440-52 LM* 14 39 00.3086540071 +18 39 38.710151529   19.6 18.39 17.3 14.64 sdM7 68 0
70 LP 384-16 PM* 15 35 11.7431829400 +26 03 14.075194546   19.2   17.0   usdM4 10 0
71 LP 225-22 PM* 16 24 33.8352249965 +39 51 48.924376786   19.3   17.1   d/sdM1 19 0
72 G 19-7 PM* 16 57 05.7362228328 -04 20 56.318033870   13.92 12.25 10.99 9.432 dM4 122 0
73 LP 226-32 PM* 17 04 25.5967785141 +39 03 23.967984971   18.7   16.7   esdM3 11 0
74 G 181-33 Pe* 17 15 46.6312843002 +30 37 57.515339727   15.88   14.2   esdK7 17 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 18 0
78 LP 141-1 LM* 18 45 52.2450125367 +52 27 40.624600956   16.72 14.96 14.67   d/sdM4 48 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 10 0
81 Wolf 1130 PM* 20 05 02.1950576493 +54 26 03.234326252   11.970 13.883     sdM1 153 0
82 LP 515-3 LM* 20 19 04.5756924481 +12 35 04.034862267   16.5   14.8   usdM0 30 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 13 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 15 0
87 LP 758-60 LM* 21 55 47.9570859391 -11 21 42.774681998     17.40     esdM5 26 0
88 GAT 1385 PM* 22 05 47.0618056870 +53 53 44.747508223   17.2   15.1   usdM1 16 0
89 L 716-108 LM* 22 20 26.9741373768 -24 21 49.524416279   14.0       sdK7 16 0
90 Wolf 1037 LM* 22 28 49.0327130449 +05 48 14.032570122   15.63   13.77   usdK7 36 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 370 0
92 LP 463-65 PM* 23 51 18.5990035564 +21 01 09.017889335   20.0   16.6   usdM4 11 0
93 NAME Galactic Bulge reg ~ ~           ~ 4794 0

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