2004PASP..116.1105W

Query : 2004PASP..116.1105W

2004PASP..116.1105W - Publ. Astron. Soc. Pac., 116, 1105-1110 (2004/December-0)

The χ factor: determining the strength of activity in low-mass dwarfs.

WALKOWICZ L.M., HAWLEY S.L. and WEST A.A.

Abstract (from CDS):

We describe a new, distance-independent method for calculating the magnetic activity strength in low-mass dwarfs, LHα/Lbol. Using a well-observed sample of nearby stars and cool standards spanning spectral type M0.5 to L0, we compute χ, the ratio between the continuum flux near Hα and the bolometric flux, fλ6560/fbol. This ratio can be multiplied by the measured equivalent width of the Hα emission line to yield LHα/Lbol. We provide χ values for all objects in our sample, and also fits to χ as a function of color and average values by spectral type. This method was used by West et al. to examine trends in magnetic activity strength in low-mass stars.

Abstract Copyright: ∼

Journal keyword(s): Stars: Late-Type - Stars: Low-Mass, Brown Dwarfs - Methods: Data Analysis

Simbad objects: 77

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Number of rows : 77
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 225213 PM* 00 05 24.4284351777 -37 21 26.507931505 11.074 10.022 8.562 7.589 6.432 M2V 229 0
2 G 158-27 PM* 00 06 43.1973190107 -07 32 17.019101068     13.837 13.605 10.15 M5.5V 257 0
3 G 158-50 ** 00 15 28.11090 -16 08 01.6303 14.49 13.187 11.483 10.273 8.711 M4V 142 0
4 HD 1326 PM* 00 18 22.8849799680 +44 01 22.637951588   9.61 8.14 7.3   M2V 602 0
5 HD 1326B PM* 00 18 25.8251408611 +44 01 38.092431857   12.84 11.04 10.3   M3.5V 317 0
6 V* DY Psc BY* 00 24 24.6317407560 -01 58 19.954412004     19.42 17.301 15.022 M9.5V 220 1
7 2MASS J00553841+2756523 LM* 00 55 38.4251516544 +27 56 52.271712996           M7V 4 0
8 SIPS J0058-0651 BD* 00 58 42.5485933944 -06 51 24.034791564         17.671 L0V 37 0
9 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
10 V* TZ Ari PM* 02 00 12.9563198327 +13 03 07.000569241 15.406 14.100 12.298 10.943 9.195 M4.5V 325 0
11 V* BX Cet BY* 02 36 15.2668724487 +06 52 17.915599626   13.28   11.405   M3.5V 219 1
12 2MASS J02422521+1343126 LM* 02 42 25.2087435936 +13 43 12.627309936           M6.5V 5 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 2MASS J02444613+1535313 ** 02 44 46.13352 +15 35 31.3764           M5V+M5.5V 3 0
15 2MASS J02512220+2521236 LM* 02 51 22.2202448808 +25 21 23.558424192           M9V 9 0
16 Cl* Melotte 22 KPNO 2 BD* 03 45 43.1616128256 +25 40 23.239779672         17.36 L0V 136 0
17 Wolf 1288 LM* 03 48 03.5071974792 +23 44 18.082255344   15.42 13.94 13.57   M7.5V 16 0
18 * omi02 Eri C PM* 04 15 21.5359980886 -07 39 20.694578096   12.85 11.17     M4.5V 249 0
19 G 175-34 PM* 04 31 11.5144294005 +58 58 37.463848495     10.98     M4.0V 175 0
20 2MASS J04354898+1537198 LM* 04 35 48.9828572784 +15 37 19.800635844           M6e 6 0
21 L 737-9 ** 05 08 35.0445036598 -18 10 19.388922597 12.893 11.809 10.302 9.161 7.661 M3.5V 109 0
22 HD 36395 PM* 05 31 27.3957852161 -03 40 38.024004501 10.626 9.443 7.968 6.996 5.913 M1.5Ve 574 0
23 Ross 47 BY* 05 42 09.2676872099 +12 29 21.604835564 14.264 13.130 11.509 10.298 8.709 M4V 304 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 42581B BD* 06 10 34.80 -21 52 00.0           T6.5 549 0
26 HD 265866 PM* 06 54 48.9580633365 +33 16 05.438282419   11.47   9.650   M3V 277 0
27 BD+05 1668 PM* 07 27 24.4989685603 +05 13 32.841491057 12.558 11.443 9.872 8.699 7.161 M3.5V 477 0
28 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
29 Ross 619 PM* 08 11 57.5691729379 +08 46 22.952885566   14.60 12.834 12.527   M4.5V 227 0
30 L 674-15 PM* 08 12 40.8889728169 -21 33 06.982558553   13.81 12.13 11.75 9.24 M3.5V 130 0
31 G 51-15 PM* 08 29 49.3527921926 +26 46 33.624143059   16.87   14.736   M6.5Ve 326 0
32 2MASS J08555592+3803430 LM* 08 55 55.9224265512 +38 03 42.945401988           M9V 6 0
33 V* AD Leo PM* 10 19 36.2808181226 +19 52 12.010446571   10.82 9.52 9.19   dM3 1469 1
34 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
35 LP 213-68 ** 10 47 13.7778721616 +40 26 49.263789176   21.2   19.1   M8+L0 42 0
36 LP 731-58 PM* 10 48 12.6142508200 -11 20 09.610693470     15.784 16.01 11.25 M6.5V 198 0
37 Wolf 359 PM* 10 56 28.9208702274 +07 00 53.003285286 16.706 15.541 13.507 11.684 9.507 dM6 775 0
38 Ross 104 PM* 11 00 04.2570074282 +22 49 58.645009946 12.826 11.584 10.020 8.952 7.646 M4V 222 0
39 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
40 BD+44 2051 PM* 11 05 28.5769490063 +43 31 36.386948721 11.440 10.270   7.9   M1.0V 368 0
41 BD+44 2051B PM* 11 05 30.8855820790 +43 31 17.885197587   16.45 14.45 13.4   M6.0V 279 0
42 G 254-29 PM* 11 47 41.3869161825 +78 41 28.176228837   12.741   10.0   M4.0V 208 0
43 Ross 128 PM* 11 47 44.3972681420 +00 48 16.400337591 14.223 12.905 11.153 9.859 8.184 dM4 484 0
44 V* GL Vir PM* 12 18 59.3997287457 +11 07 33.773236317   15.68 13.90 13.55   M4.5Ve 191 0
45 BD+11 2576 PM* 13 29 59.7858994351 +10 22 37.784532575 11.728 10.524 9.029 8.07 7.013 M1.0V 313 0
46 HD 119850 PM* 13 45 43.7755597223 +14 53 29.471707437 10.989 9.894 8.50 7.465 6.363 M2V 402 0
47 BD-11 3759 BY* 14 34 16.8116623459 -12 31 10.414495538 14.041 12.915 11.317 10.093 8.473 M3.5V 221 0
48 2MASS J14342644+1940499 LM* 14 34 26.4344486472 +19 40 49.753899264           M8V 10 0
49 HD 131976 ** 14 57 26.53330 -21 24 41.5778 10.759 9.559 8.065 7.075 9.02 M1.5V 265 1
50 BD-07 4003 BY* 15 19 26.8269387505 -07 43 20.189497466 13.403 11.76 10.560 9.461 8.911 M3V 717 2
51 G 202-48 PM* 16 25 24.6230388531 +54 18 14.765465640   11.78 10.07 9.66   M1.5V 248 0
52 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
53 Wolf 629 PM* 16 55 25.2222453644 -08 19 21.296969167 14.691 13.436 11.759 10.574 9.044 M3.5V 243 0
54 G 203-47 SB* 17 09 31.5435804441 +43 40 52.772862930   13.46 13.671 11.511   M3.5V 106 0
55 HD 155876 SB* 17 12 07.91174 +45 39 57.2157   10.250 9.523 9.3   M3V 220 0
56 2MASS J17331893+4633593 LM* 17 33 18.9384159384 +46 33 59.248987740           M9.5V 16 0
57 BD+68 946 PM* 17 36 25.8993094605 +68 20 20.909627174 11.73 10.65   8.3   M3.0V 345 0
58 BD+18 3421 PM* 17 37 53.3468417549 +18 35 30.164096453 12.315 11.109 9.577 8.599 7.525 M1.5V 257 0
59 NAME Barnard's star BY* 17 57 48.4984700685 +04 41 36.113879676 12.497 11.24 9.511 8.298 6.741 M4V 907 2
60 G 154-44 PM* 18 07 32.8377103659 -15 57 47.068393789   15.44 13.48 12.08 10.31 M4.0Ve 115 0
61 G 258-33 PM* 18 18 57.2325828283 +66 11 33.304331650   15.29   13.096   M4.5Ve 116 0
62 HD 173739 PM* 18 42 46.7043860406 +59 37 49.409446059   10.43 8.93     M3V 427 1
63 HD 173740 PM* 18 42 46.8946714770 +59 37 36.721161413   11.32 9.78     M3.5V 381 1
64 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
65 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
66 HD 199305 PM* 20 53 19.7889212813 +62 09 15.817261385   10.459   7.7   M1.0V 258 0
67 Ross 775 SB* 21 29 36.8119745172 +17 38 35.865489455 13.177 11.928 10.303 9.163 7.709 M3.0V 150 0
68 L 788-34 PM* 22 23 06.9968051575 -17 36 26.333040286   15.135 13.316 12.878 10.04 M4.5Ve 120 0
69 HD 239960 ** 22 27 59.47299 +57 41 45.2325           M3 286 0
70 V* EV Lac PM* 22 46 49.7312610268 +44 20 02.374381562   11.85 10.26 9.89   M4.0Ve 993 2
71 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
72 2MASS J22585897+1520461 LM* 22 58 58.9621937928 +15 20 46.112512200           M7V 6 0
73 2MASS J23001886+1210238 LM* 23 00 18.8756204424 +12 10 23.712734460           M4.5V 4 0
74 BD+19 5116 ** 23 31 52.17898 +19 56 14.1505 12.737 11.749 10.165 8.982 7.446 M3.5V 469 0
75 G 157-77 PM* 23 35 10.4624266947 -02 23 20.613547105   16.60 14.69 14.447   M5.0Ve 126 0
76 Ross 248 BY* 23 41 55.0363002516 +44 10 38.818911116   14.19   11.1   M5.0V 361 0
77 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

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