2017ApJ...849...99Z

Query : 2017ApJ...849...99Z

2017ApJ...849...99Z - Astrophys. J., 849, 99-99 (2017/November-2)

VLBA trigonometric parallax measurement of the semi-regular variable RT Vir.

ZHANG B., ZHENG X., REID M.J., HONMA M., MENTEN K.M., BRUNTHALER A. and KIM J.

Abstract (from CDS):

We report a trigonometric parallax measurement of 22 GHz H2O masers toward the semi-regular variable RT Vir from multi-epoch Very Long Baseline Array observations. The parallax of 4.417 ± 0.134 mas, corresponding to a distance of 226 ± 7 pc, is significantly different from the Hipparcos parallax, but is consistent with a distance derived from the period-luminosity relation (PLR). This suggests that the Hipparcos parallax suffers from systematic bias, possibly owing to a variable photo-center for this giant star. As such, VLBI parallax measurements will serve as an important cross-check for Gaia. Combing our RT Vir parallax with other long period variable parallaxes, we find a Galactic PLR at an infrared K band of MK=-3.52logP+(1.10±0.08), assuming that the slope of the Large Magellanic Cloud relation is the same to that of our Galaxy.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): astrometry - masers - stars: individual: RT Virgins - stars: late-type - techniques: high angular resolution - techniques: high angular resolution

Simbad objects: 24

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Number of rows : 24
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 V* SY Scl OH* 00 07 36.2434386312 -25 29 39.966460440       13.417 8.578 M6e 74 0
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
3 V* T Lep Mi* 05 04 50.8451254800 -21 54 16.520551560   11.60 10.59     M6.5e 158 0
4 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
5 V* RW Lep Mi* 05 38 52.7354017584 -14 02 26.836474524   11.78 10.65     M8 42 0
6 V* U Lyn Mi* 06 40 46.4581408872 +59 52 01.542429300   12.47 11.52 9.72   M7e 105 0
7 V* R UMa Mi* 10 44 38.4723312408 +68 46 32.682649980   9.51 8.41     M5-8e 194 1
8 V* S Crt AB* 11 52 45.0981904920 -07 35 48.077650032   10.21 9.14     M6III 94 0
9 Z 43-56 BLL 12 53 47.0056993512 +03 26 30.430058748   17.20 16.39     ~ 91 1
10 V* RT Vir AB* 13 02 37.9814644272 +05 11 08.362884984 10.07 9.07 7.41     M8III 336 0
11 NVSS J130815+040109 Rad 13 08 15.55309690 +04 01 09.3511088           ~ 14 1
12 NVSS J131136+064647 Rad 13 11 36.52959345 +06 46 48.3110745           ~ 8 0
13 V* W Hya Mi* 13 49 02.0018313132 -28 22 03.532006894   8.97 7.70     M7.5-9e 672 0
14 V* RX Boo AB* 14 24 11.6253191184 +25 42 13.394221596   9.23 8.60     M7.5-M8 457 0
15 V* S CrB Mi* 15 21 23.9553294936 +31 22 02.584877304 7.51 7.15 5.80 8.12   M6.5-8e 364 0
16 V* U Her OH* 16 25 47.4719383584 +18 53 32.863368084 8.85 8.23 6.70     M6.5-8+e 563 1
17 6C 163718+572618 Bla 16 38 13.45629995 +57 20 23.9789828     16.90 16.94   ~ 381 1
18 3C 345 Bla 16 42 58.80997043 +39 48 36.9939552   16.81 16.59 16.84   ~ 1808 3
19 4C 51.37 Bla 17 40 36.97784792 +52 11 43.4073694   18.16 18.70 16.73   ~ 441 1
20 V* RR Aql Mi* 19 57 36.0616870728 -01 53 11.339520360     7.80 7.45   M7.5e 305 2
21 V* UX Cyg OH* 20 55 05.5117404456 +30 24 52.015482108       10.404   M6-6.5e 171 0
22 3C 454.3 Bla 22 53 57.7480438728 +16 08 53.561508864   16.57 16.10 15.22   ~ 3004 2
23 V* R Aqr Sy* 23 43 49.4634303216 -15 17 04.176349872   8.823 7.683 9.37   M6.5-8.5e 823 0
24 V* R Cas Mi* 23 58 24.8682785040 +51 23 19.713029388 6.71 6.63 4.80     M6.5-9e 728 0

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