2011AJ....141..172M


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.19CEST17:46:28

2011AJ....141..172M - Astron. J., 141, 172 (2011/May-0)

Astrometry with the Hubble space telescope: trigonometric parallaxes of selected hyads.

McARTHUR B.E., BENEDICT G.F., HARRISON T.E. and VAN ALTENA W.

Abstract (from CDS):

We present absolute parallaxes and proper motions for seven members of the Hyades open cluster, pre-selected to lie in the core of the cluster. Our data come from archival astrometric data from fine guidance sensor (FGS) 3 and newer data for three Hyads from FGS 1r, both white-light interferometers on the Hubble Space Telescope (HST). We obtain member parallaxes from six individual FGS fields and use the field containing van Altena 622 and van Altena 627 (= HIP 21138) as an example. Proper motions, spectral classifications, and VJHK photometry of the stars comprising the astrometric reference frames provide spectrophotometric estimates of reference star absolute parallaxes. Introducing these into our model as observations with error, we determine absolute parallaxes for each Hyad. The parallax of vA 627 is significantly improved by including a perturbation orbit for this previously known spectroscopic binary, now an astrometric binary. Compared to our original (1997) determinations, a combination of new data, updated calibration, and improved analysis lowered the individual parallax errors by an average factor of 4.5. Comparing parallaxes of the four stars contained in the Hipparcos catalog, we obtain an average factor of 11 times improvement with the HST. With these new results, we also have better agreement with Hipparcos for the four stars in common. These new parallaxes provide an average distance for these seven members, <D≥47.5pc, for the core, a ±1σ dispersion depth of 3.6 pc, and a minimum depth from individual components of 16.0±0.9 pc. Absolute magnitudes for each member are compared to established main sequences with excellent agreement. We obtain a weighted average distance modulus for the core of the Hyades of m - M = 3.376±0.01, a value close to the previous Hipparcos values, m - M = 3.33±0.02.

Abstract Copyright:

Journal keyword(s): astrometry - instrumentation: interferometers - parallaxes - proper motions - stars: distances - stars: individual: Hyades

Simbad objects: 37

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Number of rows : 37

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * ups And PM* 01 36 47.84216 +41 24 19.6443 4.70 4.64 4.10 3.64 3.35 F9V 892 1
2 V* FS Cet WD* 02 35 07.5939678751 +03 43 56.817951540 11.027 12.209 12.412 12.325 11.968 DA1+dM 353 0
3 * eps Eri BY* 03 32 55.8449634 -09 27 29.731165 5.19 4.61 3.73 3.00 2.54 K2V 1713 1
4 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 3022 0
5 V* V990 Tau BY* 04 24 16.9397523417 +18 00 10.515757018   11.035 9.966 9.364 8.864 K5V 104 0
6 LP 475-68 PM* 04 26 04.7064252817 +15 02 28.987989321   13.71 12.24 11.85   M1V 37 0
7 Cl Melotte 25 OpC 04 26 54.00 +15 52 00.0           ~ 2693 0
8 HD 28258 PM* 04 28 04.4336082048 +13 52 04.581177543   9.860 9.032 9.03   G5V 112 0
9 HD 285805 BY* 04 29 30.9847018452 +16 14 41.229394927   11.48 10.629 10.02   K4V 80 0
10 LP 13-691 PM* 04 31 29.0700360833 +17 43 07.178157317   13.28 11.87 11.52   K7V 48 0
11 HD 285849 * 04 31 31.9579855158 +17 44 59.143267933   11.11 10.66     F0 2 0
12 HD 28634 SB* 04 31 37.1109731928 +17 42 34.917445957   10.515 9.517 9.43   K2V 73 0
13 HD 285876 PM* 04 31 52.4722287818 +15 29 58.133228299   12.300 11.000 10.622   K0V 79 0
14 HD 33636 Pe* 05 11 46.4489745849 +04 24 12.759759957   7.64   6.6   G0V_CH-0.3 166 1
15 * bet Dor cC* 05 33 37.5125319201 -62 29 23.323100433 5.13 4.58 3.76 3.55 3.12 F8/G0Ib 348 0
16 HD 38529 PM* 05 46 34.9129896843 +01 10 05.512540812       5.4   G8III/IV 309 2
17 NGC 2168 OpC 06 08 54 +24 20.0           ~ 462 0
18 * 48 Aur cC* 06 28 34.0875086 +30 29 34.914168 6.73 6.23 5.55   4.777 F5.5-G0Ib 361 0
19 * zet Gem cC* 07 04 06.5307903 +20 34 13.073871 5.20 4.58 3.79   3.082 G1Ib 536 0
20 IC 2391 OpC 08 40 32 -53 02.0           ~ 723 0
21 NGC 2682 OpC 08 51 18 +11 48.0           ~ 2054 0
22 * rho01 Cnc PM* 08 52 35.8113282132 +28 19 50.956901366 7.45 6.82   5.4   K0IV-V 978 1
23 * l Car cC* 09 45 14.8112246 -62 30 28.451894   4.33 3.40     G5Iab/b 291 1
24 V* V645 Cen Er* 14 29 42.9451234609 -62 40 46.170818907 14.21 12.95 11.13 9.45 7.41 M5.5Ve 984 0
25 HD 136118 PM* 15 18 55.4730161019 -01 35 32.597619958   7.46 6.94     F7V 109 1
26 HD 138311 * 15 31 56.7411372556 -20 37 43.529577386   9.29 8.84     F5V 7 0
27 V* X Sgr cC* 17 47 33.6241002643 -27 49 50.848981593 5.84 5.34 4.54 6.03 3.661 F7II 308 0
28 NAME Barnard's star BY* 17 57 48.4997994034 +04 41 36.111354228 12.497 11.24 9.511 8.298 6.741 M4V 665 2
29 * gam01 Sgr cC* 18 05 01.2265190155 -29 34 48.303215344 5.99 5.47 4.69   3.869 G0Ib/II 327 0
30 V* Y Sgr cC* 18 21 22.9864295 -18 51 36.001763 7.31 6.69 5.75   4.810 F8II 270 0
31 V* FF Aql cC* 18 58 14.7482217777 +17 21 39.295590199 6.61 6.18 5.38     F6Ib 342 0
32 Wolf 1062 ** 19 12 14.6156897487 +02 53 11.438190161 13.722 12.663 11.143 10.016 8.534 M3.5V 132 0
33 V* RR Lyr RR* 19 25 27.9123232234 +42 47 03.690634101   7.36   7.6   A8-F7 883 0
34 V* T Vul cC* 20 51 28.2382502598 +28 15 01.816605372 6.89 6.49 5.77   5.061 F5Ib+A0.8V 318 0
35 * del Cep B V*? 22 29 09.2460235698 +58 24 14.743960258 5.95 6.28 6.30     B7IV 142 0
36 * del Cep cC* 22 29 10.2650184 +58 24 54.713856 4.71 4.35 3.75   3.219 F5Iab:+B7-8 682 0
37 BD-15 6290 BY* 22 53 16.7323107416 -14 15 49.303409936 12.928 11.749 10.192 9.013 7.462 M3.5V 861 1

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2020.10.19-17:46:28

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