2004A&A...425..519S


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.18CET10:54:58

2004A&A...425..519S - Astronomy and Astrophysics, volume 425, 519-527 (2004/10-2)

The nearest cool white dwarf (d∼4pc), the coolest M-type subdwarf (sdM9.5), and other high proper motion discoveries.

SCHOLZ R.-D., LEHMANN I., MATUTE I. and ZINNECKER H.

Abstract (from CDS):

We report the discovery of seven high proper motion stars with proper motions between about 0.7 and 2.2arcsec/yr, all at relatively low Galactic latitudes (13°<|b|<35°) and located in the southern sky. They were detected in a high proper motion search using multi-epoch positions in the optical SuperCOSMOS Sky Surveys and in the near-infrared sky surveys 2MASS and DENIS. Classification spectroscopy carried out for six of the objects reveals them to represent three different classes of cool objects in the solar neighbourhood: M dwarfs, M subdwarfs and cool white dwarfs. The star with the largest proper motion, SSSPM J1138-7722, is classified as a very nearby (d∼8pc) M 5.5 dwarf with Galactic thin disk kinematics. A second star with ∼2arcsec/yr proper motion, SSSPM J1358-3938, is still lacking spectroscopic confirmation but can be classified from photometry as a thick disk ∼M3.5 dwarf. Three objects turn out to be cool subdwarf members of the Galactic thick disk or halo, including the first sdM9.5 object, SSSPM J1013-1356, which represents the currently coolest known M subdwarf, another ultra-cool subdwarf, SSSPM J1930-4311, of spectral type sdM7.0 as well as an earlier type (sdM1.5) star. The latter, SSSPM J1530-8146, has an extremely large space velocity with clear halo kinematics (heliocentric (U,V,W)=(-534±78,-239±74,+188±23)km/s). Two objects show featureless spectra classifying them as cool white dwarfs with Teff<4500 K. One of them, SSSPM J1549-3544, is an extremely nearby (d∼4pc) thin disk object, the other one, SSSPM J1148-7458, has thick disk kinematics. SSSPM J1549-3544 is likely to be the nearest cool white dwarf and may be even the nearest isolated white dwarf, i.e. closer than van Maanen 2.

Abstract Copyright:

Journal keyword(s): astrometry - surveys - stars: kinematics - stars: low-mass, brown dwarfs - stars: subdwarfs - stars: white dwarfs

CDS comments: SSSPM J2231-7415 is a misprint for SSSPM J2231-7515; in section 4.3, "LHS 337" should read "LHS 377".

Simbad objects: 28

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Number of rows : 28

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 G 158-27 PM* 00 06 43.1972293497 -07 32 17.024270968   15.72 13.837 13.605 10.15 M5.5V 165 0
2 Wolf 28 WD* 00 49 09.8984116191 +05 23 18.993107442 12.984 12.92 12.374 12.106 11.854 DZ7.5 217 0
3 LP 469-67 PM* 02 02 16.2424149421 +10 20 13.953769861   17.63   15.711   M5.5V 45 0
4 V* CD Cet BY* 03 13 22.9175232961 +04 46 29.343777709   15.61 14.001 13.650   M4.5Ve 104 0
5 L 372-58 PM* 03 35 59.6996745075 -44 30 45.725264343 16.22 14.98 13.07 11.45 9.47 M5.5V 72 0
6 Wolf 1057 LM* 03 42 29.4265322441 +12 31 33.585218610   14.46 12.841 12.466   sdM1.5 39 0
7 APMPM J0559-2903 PM* 05 58 58.9231280556 -29 03 26.708087027       18.12 16.32 esdM7 21 0
8 SSSPM J1013-1356 LM* 10 13 07.3466815701 -13 56 21.261098713       18.73 16.01 sdM9.5 33 0
9 BD+44 2051B Fl* 11 05 30.8856443432 +43 31 17.884318012   16.45 14.45 13.4   M6.0V 205 0
10 SCR J1138-7721 PM* 11 38 16.7749923192 -77 21 48.580288885     14.780 13.20 11.25 M5.0V 13 0
11 SSSPM J1148-7458 WD* 11 47 34.4518249334 -74 57 59.239641929           DC11+ 3 0
12 SSSPM J1358-3938 PM* 13 58 05.4052293528 -39 37 55.135870568   20.20       M3.5 5 0
13 LSPM J1425+7102 LM* 14 25 05.0227940507 +71 02 09.678947111   20.8   18.61 16.21 sdM8 29 0
14 LP 440-52 LM* 14 39 00.3087274496 +18 39 38.704121134   19.6 18.39 17.3 14.64 sdM7.0 57 0
15 SSSPM J1530-8146 PM* 15 30 28.7303430988 -81 45 37.405249767           sdM1.5 6 0
16 SSSPM J1549-3544 WD* 15 48 40.1716716496 -35 44 26.171254820           DC11 7 0
17 LSR J1610-0040 LM* 16 10 28.9562440851 -00 40 53.300190959       17.51 14.81 sdM7 45 0
18 [TBF80] 3 PM* 17 15 11.8853565625 -27 33 01.443061413           G5V 2 0
19 LP 102-320 PM* 17 55 33.4218913949 +58 24 27.503428716   19.0 17.98 16.6 14.02 M5.5V 32 0
20 LP 141-1 LM* 18 45 52.2452564851 +52 27 40.623179319   16.96   13.9   sdM4.5 42 0
21 SSSPM J1930-4311 PM* 19 29 41.0056452742 -43 10 36.266775011       18.42 16.32 sdM7 7 1
22 Wolf 1130 Fl* 20 05 02.1949477691 +54 26 03.227818091   11.970 13.883     sdM1.5 116 0
23 LSPM J2036+5100 LM* 20 36 21.6141972503 +51 00 04.698980889       17.46 15.26 sdM7.5 23 1
24 SCR J2230-7515 WD* 22 30 33.5339295738 -75 15 24.304278222   18.24 16.87 16.17 15.51 DC12 19 1
25 SCR J2230-7513 WD* 22 30 39.9812733216 -75 13 55.235520507   17.56 16.60 15.93 15.33 DC9 22 1
26 EGGR 453 WD* 22 53 53.3851195567 -06 46 54.488931649   17.53 15.66 15.70   DZ13 85 1
27 G 157-77 PM* 23 35 10.4621642606 -02 23 20.614795879   16.60 14.69 14.447   M5.0Ve 65 0
28 Ross 248 BY* 23 41 55.0361186415 +44 10 38.825189497   14.19   11.1   M5.0V 268 0

    Equat.    Gal    SGal    Ecl

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2020.01.18-10:54:58

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