2014AJ....147...21J


Query : 2014AJ....147...21J

2014AJ....147...21J - Astron. J., 147, 21 (2014/January-0)

The solar neighborhood. XXXI. Discovery of an unusual red+white dwarf binary at ∼25 pc via astrometry and UV imaging.

JAO W.-C., HENRY T.J., SUBASAVAGE J.P., WINTERS J.G., GIES D.R., RIEDEL A.R. and IANNA P.A.

Abstract (from CDS):

We report the discovery of a nearby M5.0V dwarf at 24.6 pc, SCR 1848-6855, that is orbited by an unusual companion causing an astrometric perturbation of more than 200 mas. This is by far the largest perturbation found to date among more than 700 targets observed during our long-term astrometry/photometry program at the CTIO 0.9 m telescope. We present here a suite of astrometric, photometric, and spectroscopic observations of this high proper motion (∼1.''3/yr) system in an effort to reveal the nature of this unusual binary. The measured near-UV and optical U band fluxes exceed those expected for comparable M5.0V stars, and excess flux is also detected in the spectral range 4000-7000 Å. The elusive companion has been detected in HST-STIS+MAMA images at 1820 Å and 2700 Å, and our analysis shows that it is probably a rare, cool, white dwarf with T = 4600-5500 K. Given the long-term astrometric coverage, the prospects for an accurate mass determination are excellent, although as yet we can only provide limits on the unusual companion's mass.

Abstract Copyright:

Journal keyword(s): astrometry - solar neighborhood - stars: distances - stars: late-type - white dwarfs

Simbad objects: 26

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Number of rows : 26
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 LP 645-46 WD* 00 32 09.8585058586 -02 54 01.650664680   18.44 17.34     DA 21 0
2 LP 53-7 WD* 02 26 31.9634303059 +64 59 29.919690439   20.9 18.8 17.5   DC 19 0
3 V* CD Cet BY* 03 13 22.9175070353 +04 46 29.336548127   15.61 14.001 13.650   M4.5V 121 0
4 G 221-10 WD* 03 30 13.4196352127 +74 01 58.147711676   18.02 16.46 16.89   DC7 26 0
5 L 372-58 PM* 03 35 59.6991613260 -44 30 45.730830569 16.22 14.98 13.07 11.45 9.47 M5.5V 96 0
6 EGGR 485 WD* 07 00 51.6637780968 +31 57 43.832015694   17.53   15.7   DC10 42 0
7 G 112-50 PM* 07 51 54.6712965202 -00 00 12.259020776 15.86 14.95 13.26 11.9 10.17 M4.5V 48 0
8 LP 845-23 PM* 09 07 02.7474767869 -22 08 50.038247668 17.06 16.08 14.232 13.950 11.13 M4.5 24 0
9 L 140-289 PM* 09 42 49.5996601736 -63 37 55.876933772 15.94 14.97 13.30 11.98 10.28 M4.5V 17 0
10 LP 732-35 PM* 11 31 08.3872209967 -14 57 21.252043993 16.97 15.97 14.24 14.33 10.94 M5 43 0
11 Ruiz 439-26 WD* 11 39 03.1039070557 -28 52 16.629435604     20.64 19.71   DC 34 1
12 V* GL Vir Er* 12 18 59.3997287457 +11 07 33.773236317   15.68 13.90 13.55   M4.5Ve 155 0
13 LP 322-800 WD* 13 03 17.8842961560 +26 03 13.511232711   20.01   18.6   DC9 27 0
14 EGGR 438 WD* 13 48 03.0103253113 +23 34 46.443561286   16.72   15.2   DC9 65 0
15 NAME Proxima Centauri Er* 14 29 42.9461331854 -62 40 46.164680672 14.21 12.95 11.13 9.45 7.41 M5.5Ve 1144 0
16 LP 801-9 WD* 14 47 25.3408507940 -17 42 15.755350506   17.42 16.46     DC10 38 0
17 G 203-42 PM* 17 03 23.8838600746 +51 24 22.868680261   15.31   13.301   M5.0V 58 0
18 G 227-28 WD* 18 21 19.8310303352 +61 01 07.383349520   16.62   15.0   DA10 46 0
19 SCR J1848-6855 ** 18 48 20.9755651597 -68 55 34.370452247 18.35 18.13 16.86 15.68 13.83 M5.0V 9 0
20 2MASS J18482451-6854429 * 18 48 24.5227148016 -68 54 42.899439852           ~ 1 0
21 EGGR 498 WD* 20 05 34.8732768746 -10 56 54.432926709   17.91 16.89 16.4   DA10 49 0
22 CD-30 17706 WD* 20 10 56.8486912016 -30 13 06.627142663 11.654 12.286 12.242 12.311 12.381 DA3.1 234 0
23 * eps Aqr * 20 47 40.5526029 -09 29 44.787712 3.79 3.77 3.77 3.70 3.70 B9.5V 265 0
24 Ross 193B WD* 20 56 47.7846012257 -04 50 39.537436123   17.81 16.68     DC10 65 0
25 EGGR 453 WD* 22 53 53.3851734316 -06 46 54.488228178   17.53 15.66 15.70   DZ13 87 1
26 EGGR 555 WD* 23 19 09.5180510356 -06 12 49.960884664   19.47 18.22     DC9 43 0

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2022.08.10-07:49:14

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