2020AJ....159...52M

Query : 2020AJ....159...52M

2020AJ....159...52M - Astron. J., 159, 52-52 (2020/February-0)

Magnetic inflation and stellar mass. V. Intensification and saturation of M-dwarf absorption lines with Rossby number.

MUIRHEAD P.S., VEYETTE M.J., NEWTON E.R., THEISSEN C.A. and MANN A.W.

Abstract (from CDS):

In young Sun-like stars and field M-dwarf stars, chromospheric and coronal magnetic activity indicators such as Hα, X-ray, and radio emission are known to saturate with low Rossby number (Ro <= 0.1), defined as the ratio of rotation period to convective turnover time. The mechanism for the saturation is unclear. In this paper, we use photospheric Ti I and Ca I absorption lines in the Y band to investigate magnetic field strength in M dwarfs for Rossby numbers between 0.01 and 1.0. The equivalent widths of the lines are magnetically enhanced by photospheric spots, a global field, or a combination of the two. The equivalent widths behave qualitatively similar to the chromospheric and coronal indicators: we see increasing equivalent widths (increasing absorption) with decreasing Ro and saturation of the equivalent widths for Ro <= 0.1. The majority of M dwarfs in this study are fully convective. The results add to mounting evidence that the magnetic saturation mechanism occurs at or beneath the stellar photosphere.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): M dwarf stars - Stellar rotation - Stellar properties - Stellar activity - Magnetic fields - High resolution spectroscopy - Spectroscopy - Infrared astronomy - Near infrared astronomy

VizieR on-line data: <Available at CDS (J/AJ/159/52): table1.dat table3.dat>

Simbad objects: 72

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Number of rows : 72
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 BD+44 4548 PM* 00 05 10.8891989003 +45 47 11.641457986   11.45   9.2   M2Ve 187 0
2 G 32-7 PM* 00 16 16.1530187091 +19 51 50.474211828   14.82   12.904   M4.0V 81 0
3 G 32-37 PM* 00 39 33.5473324656 +14 54 19.063134271   15.9   13.929   M4.0V 42 0
4 G 69-32 PM* 00 54 48.0816664043 +27 31 03.624729354   16.5   13.7   M4.5V 34 0
5 Wolf 47 PM* 01 03 19.8350070578 +62 21 55.837228636   15.34 13.21 12.4   M5V 232 0
6 V* YZ Cet PM* 01 12 30.6368826382 -16 59 56.358011559 15.315 13.885 12.074 10.696 8.938 M4.0Ve 335 0
7 LSPM J0119+5450 PM* 01 19 26.2805376120 +54 50 38.211373572   17.5   14.8   ~ 9 0
8 G 159-46 PM* 02 12 54.6227971921 +00 00 16.856670101   15.26 13.58 12.31 10.66 M4V 71 0
9 LP 197-37 ** 02 40 52.4205853820 +44 52 35.069373903   14.73 13.11 12.77   dM4.0 15 0
10 LP 356-15 PM* 03 24 12.8605982256 +23 46 19.059233052   13.39 11.838 11.489   M2.5V 43 1
11 LP 413-24 PM* 03 39 07.1296199856 +20 25 26.699785896   16.5   14.1   M4.5 34 0
12 G 80-21 PM* 03 47 23.3412414313 -01 58 19.947831323 14.052 13.048 11.537 10.452 9.098 M3.0V 153 0
13 HG 8-8 PM* 04 02 24.4243877928 +24 41 24.421233516   14.51   12.562   M2.7 24 0
14 1RXS J041417.0-090650 EB? 04 14 17.3079121464 -09 06 54.605273184     13.884 13.612 11.107 M4.3V 46 0
15 LSPM J0430+3601 PM* 04 30 18.2267406456 +36 01 34.257339228   14.1   12.284   dM2.0 18 0
16 Cl Melotte 25 OpC 04 30 27.4 +16 46 43           ~ 3309 0
17 LP 834-32 LM* 04 35 36.1920843744 -25 27 34.587319140   13.95 12.41 12.08 9.720 M3.5 43 0
18 HD 285968 PM* 04 42 55.7750207949 +18 57 29.395947044 12.668 11.49 9.951 8.931 7.702 M2.5V 391 2
19 RX J0451.0+3127 Em* 04 51 01.4205787920 +31 27 23.693536152   14.56   13.029   M3.7V 24 0
20 G 100-46 PM* 05 53 22.9685720616 +22 12 49.784064876   15.95   14.022   M4V 23 0
21 G 99-49 PM* 06 00 03.5042217306 +02 42 23.592579736   12.97 11.31 10.92 8.43 M3.5Ve 170 0
22 G 192-15 PM* 06 02 29.1943155520 +49 51 56.155536974   16.32   13.4   M5.0V 88 0
23 LSPM J0604+0741 LM* 06 04 38.8726591104 +07 41 54.550684536   16.9   14.8   M6V 17 0
24 HD 42581 PM* 06 10 34.6149358167 -21 51 52.656352926 10.801 9.607 8.125 7.164 6.121 M1V 544 0
25 HD 43607 * 06 17 50.8693946400 +19 27 25.820066052   7.47 7.52     A0V 29 0
26 LSPM J0644+1628 PM* 06 44 47.5230584112 +16 28 17.837371884   15.67   13.66   M3V 13 0
27 LSPM J0710+4700 PM* 07 10 13.4204221728 +47 00 58.009107960   14.4   12.996   ~ 10 0
28 LP 162-1 PM* 07 17 08.9508868872 +45 45 54.147242052   16.6   14.1   M4 14 0
29 BD-02 2198 SB* 07 36 07.0735561631 -03 06 38.741979616 12.551 11.347 9.871 8.925 7.891 M1.0V 87 0
30 PSS 544-1 PM* 07 37 43.8469167648 +05 54 36.853167060   15.55   13.782   M3V 14 0
31 LSPM J0738+2400 PM* 07 38 29.4980478888 +24 00 08.654577588   14.59   12.689   M2.7V 46 0
32 V* YZ CMi PM* 07 44 40.1723046464 +03 33 08.875227574 13.761 12.831 11.225 9.958 8.263 M4.0Ve 957 0
33 LSPM J0755+5257 PM* 07 55 12.0770600808 +52 57 54.012076812   15.3   14.023   dM4.5 22 0
34 G 50-21 PM* 08 10 53.6259310578 +03 58 33.606506082   14.6   13.145   M4V 30 0
35 LSPM J0837+0333 PM* 08 37 30.2183434992 +03 33 45.899249220   15.6 14.346 14.019   M4.0V 26 0
36 LSPM J0840+3127 PM* 08 40 15.9834311184 +31 27 06.808923216   13.5   11.966   M3.5V 58 0
37 G 46-27 PM* 09 11 12.7048854471 +01 27 34.873112232   15.75   13.4   M4V 19 0
38 G 195-36 PM* 09 42 23.1912874069 +55 59 01.265847897   14.2   11.3   M3V 73 0
39 V* AD Leo PM* 10 19 36.2808181226 +19 52 12.010446571   10.82 9.52 9.19   dM3 1469 1
40 G 196-37 SB* 10 36 48.1587713684 +50 55 03.920894318   16.15   14.325   M4.5V 35 0
41 V* DS Leo BY* 11 02 38.3420210088 +21 58 01.700013360 12.246 11.049 9.572 8.638 7.634 M1.0Ve 269 0
42 LP 263-64 PM* 11 03 09.9882584544 +36 39 08.601698232   14.8   13.377   M3.5V 47 0
43 K2-18 PM* 11 30 14.5177445592 +07 35 18.255348492   15.01 13.50 13.24   dM2.5 153 0
44 Ross 1003 PM* 11 41 44.6358403057 +42 45 07.102117090   13.36 13.795 11.524 9.18 M4.0V 172 1
45 Ross 905 PM* 11 42 11.0933350978 +26 42 23.650782778   12.06 10.613 10.272 8.24 M3V 750 1
46 G 10-49 PM* 11 47 40.7472267384 +00 15 20.101843571   14.94 13.34 13.35 10.506 M4V 100 0
47 Ross 128 PM* 11 47 44.3972681420 +00 48 16.400337591 14.223 12.905 11.153 9.859 8.184 dM4 484 0
48 G 122-49 PM* 11 50 57.7205259231 +48 22 38.561183125       12.95   M4.5V 176 0
49 Ross 689 PM* 12 05 29.6802412346 +69 32 22.602408833   14.7   12.787   M4V 66 0
50 G 177-25 LM* 13 10 12.6292548340 +47 45 18.673788877   16.11   14.249   M5.0V 91 0
51 LP 21-224 PM* 13 53 38.7946024320 +77 37 08.150208096   14.4   12.525   M4.0Ve 60 0
52 V* OT Ser PM* 15 21 52.9325510712 +20 58 39.910874376 12.662 11.522 10.003 8.993 7.843 M1.0V 170 0
53 G 202-48 PM* 16 25 24.6230388531 +54 18 14.765465640   11.78 10.07 9.66   M1.5V 248 0
54 BD-12 4523 BY* 16 30 18.0583947383 -12 39 45.321217732 12.829 11.638 10.072 8.917 7.421 M3V 365 0
55 G 204-39 PM* 17 57 50.9660613981 +46 35 19.127676045   13.97 11.64 11.3   M2.5V 104 0
56 LP 390-16 BY* 18 13 06.5715967944 +26 01 51.859334352   14.93   12.970   M4.0V 67 0
57 BD+45 2743 PM* 18 35 18.3903206545 +45 44 38.539577234   11.26 9.830 9.400 8 M0.5V 161 0
58 Ross 149 PM* 18 36 19.2318944487 +13 36 26.373432247   13.8 12.46 12.112 9.69 M4V 83 0
59 G 141-36 PM* 18 48 17.5373479643 +07 41 21.186505469   15.6   13.817   M5.0V 70 0
60 CD-23 14742 PM* 18 49 49.3637762005 -23 50 10.447375350 13.528 12.19 10.43 10.23 7.703 M3.5Ve 421 0
61 HD 176029 PM* 18 58 00.1362313720 +05 54 29.240711762 11.888 10.673 9.217 8.286 7.31 M1.0V 186 0
62 HD 180617 PM* 19 16 55.2565688720 +05 10 08.040554168 11.768 10.63 9.115 8.076 6.782 M3-V 475 0
63 G 185-18 PM* 19 21 38.7001955897 +20 52 03.284705570   15.13 13.42 13.116 10.44 M4.0Ve 92 0
64 Wolf 1069 PM* 20 26 05.3021309544 +58 34 22.680416973   15.83   13.811   dM5.0 99 0
65 G 144-25 PM* 20 40 33.8632524043 +15 29 58.730061366   15.13 13.41 12.1 10.36 M4.5V 114 0
66 LP 816-60 PM* 20 52 33.0166041464 -16 58 29.003281943 14.094 13.029 11.458 10.251 8.658 M4V 135 0
67 HD 209290 PM* 22 02 10.2750978279 +01 24 00.832158070 11.838 10.616 9.146 8.213 7.245 M0.5V 285 0
68 V* EV Lac PM* 22 46 49.7312610268 +44 20 02.374381562   11.85 10.26 9.89   M4.0Ve 993 2
69 BD-15 6290 BY* 22 53 16.7325836486 -14 15 49.304052185 12.928 11.749 10.192 9.013 7.462 M3.5V 1106 1
70 HD 216899 PM* 22 56 34.8046530863 +16 33 12.355636588 11.323 10.143 8.638 7.657 6.542 M1.5V 335 0
71 Ross 248 BY* 23 41 55.0363002516 +44 10 38.818911116   14.19   11.1   M5.0V 361 0
72 RX J2354.8+3831 PM* 23 54 51.4580576376 +38 31 36.200975556   14.78   12.94   M3.1V 57 0

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