1998A&A...336..883F

Query : 1998A&A...336..883F

1998A&A...336..883F - Astronomy and Astrophysics, volume 336, 883-894 (1998/8-3)

The luminosity function of white dwarfs and M dwarfs using dark nebulae as opaque outer screens.

FESTIN L.

Abstract (from CDS):

By using dark nebulae as opaque outer screens, the luminosity function of white dwarfs and M dwarfs has been studied. High-extinction areas towards the Orion A, Serpens and ρ Oph cloud complexes were observed, covering a volume corresponding to 464pc3 in the solar neighbourhood, complete to MV∼16.5. Foreground stars were selected by VRI photometry and photometric parallaxes. The resulting foreground sample consists of 21 M dwarfs and 7 white dwarfs. The derived M-dwarf luminosity function is consistent with previous studies, showing no substantial upturn beyond MV=16. The 7 white dwarfs imply a local density of 0.013(±0.005)M☉/pc3 (∼15% of the dynamical mass in the solar neighbourhood) supporting other recent results but obtained with a completely different method. For the clouds, foreground-star data were used to derive independent cloud distances, while the background stars and a simple model of the Milky Way gave reliable cloud extinctions.

Abstract Copyright: ∼

Journal keyword(s): stars: late-type - low-mass - brown dwarfs - luminosity function - mass function - white dwarfs - Galaxy: solar neighbourhood - stellar content

Nomenclature: Table 2: [F98] omd NN (Nos 1-11), [F98] serpmd N (Nos 1-5), [F98] ophmd N (Nos 1-5), [F98] owd N (Nos 1-3), [F98] serpwd N (Nos 1-4).

Simbad objects: 45

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Number of rows : 45
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 [HSH97] WD 0346+246 WD* 03 46 46.5167876352 +24 56 02.665383264   20.13 19.04 18.18   DC 68 1
2 [F98] serpmd 5 * 04 29 20.4 -03 44 15           ~ 1 0
3 M 42 HII 05 35 17 -05 23.4           ~ 4076 0
4 NAME Ori A MoC 05 38 -07.1           ~ 3012 0
5 NAME LDN 1641 South DNe 05 40 27.6 -07 27 28           ~ 59 1
6 [F98] owd 2 * 05 41 04.2176302032 -08 22 56.337723948   17.68 16.21 15.87   ~ 1 0
7 [F98] omd 5 * 05 41 04.6006727016 -08 38 22.993656252           ~ 1 0
8 2MASS J05411403-0838193 * 05 41 14.0354576448 -08 38 19.435842780           ~ 1 0
9 2MASS J05411487-0825457 * 05 41 14.8741736736 -08 25 45.814887084           ~ 1 0
10 2MASS J05411759-0829441 * 05 41 17.6054822016 -08 29 44.301637176           ~ 1 0
11 [F98] omd 11 * 05 41 18.9 -08 27 39           ~ 1 0
12 [F98] omd 7 * 05 41 19.7852312112 -08 30 48.411511632           ~ 1 0
13 [F98] omd 10 * 05 41 21.5 -08 23 09           ~ 1 0
14 [F98] owd 3 * 05 41 22.6 -08 22 50           ~ 1 0
15 2MASS J05412276-0822207 * 05 41 22.7639927544 -08 22 20.732422980           ~ 1 0
16 [F98] omd 9 * 05 41 23.8156822728 -08 35 42.907540884           ~ 1 0
17 [F98] omd 8 * 05 41 31.9052277024 -08 22 38.992460772           ~ 1 0
18 [F98] owd 1 * 05 41 37.8 -08 36 08           ~ 1 0
19 2MASS J05413864-0830186 * 05 41 38.6471951544 -08 30 18.791697492           ~ 1 0
20 Wolf 358 BY* 10 50 52.0312380389 +06 48 29.259617410 14.532 13.319 11.675 10.459 8.889 M4V 263 0
21 Wolf 359 Er* 10 56 28.9208702274 +07 00 53.003285286 16.706 15.541 13.507 11.684 9.507 dM6 721 0
22 LP 907-10 PM* 11 38 50.6337626520 -28 42 30.556015056   18.5 18.220 16.471 14.341 M6.5e 8 0
23 Ruiz 439-26 WD* 11 39 03.1039070557 -28 52 16.629435604     20.64 19.71   DC 36 1
24 Ross 128 Er* 11 47 44.3972681420 +00 48 16.400337591 14.223 12.905 11.153 9.859 8.184 dM4 420 0
25 HZ 21 WD* 12 13 56.2641545952 +32 56 31.358609412 13.125 14.361 14.688 14.837 15.038 DO1 140 0
26 Wolf 424 ** 12 33 17.361480 +09 01 15.79224 15.398 14.313 12.467 10.937 8.988 M5.5V 321 0
27 NAME rho Oph Complex reg 16 25 -23.5           ~ 79 1
28 [GY92] 264 TT* 16 27 26.5812811008 -24 25 54.395321448       17.90 15.72 M8 47 0
29 BBRCG 54 TT* 16 27 30.5335023360 -24 32 34.879349616       15.64 14.30 M2 19 0
30 [GY92] 297 Y*O 16 27 36.5262764280 -24 28 33.332095092       14.67 13.30 M2 13 0
31 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3631 1
32 LDN 1689 DNe 16 32 22.5 -24 28 29           ~ 137 0
33 [F98] ophmd 2 * 16 32 42.8723116896 -24 26 54.760359660           ~ 1 0
34 [F98] ophmd 1 * 16 33 02.5758718296 -24 30 14.564897316           ~ 1 0
35 [F98] serpwd 1 * 18 26 05.7 -03 40 02           ~ 1 0
36 [F98] serpmd 1 * 18 27 10.9 -03 43 59           ~ 1 0
37 [F98] serpwd 3 WD? 18 27 41.6844179952 -03 40 38.368946712           ~ 4 0
38 [F98] serpwd 2 * 18 27 45.1 -03 46 01           ~ 1 0
39 [F98] serpmd 3 * 18 27 53.9 -03 36 53           ~ 1 0
40 [F98] serpmd 2 * 18 27 57.2553620880 -03 31 37.641999324           ~ 1 0
41 [F98] serpwd 4 * 18 28 26.4 -03 43 52           ~ 1 0
42 [F98] serpmd 4 * 18 28 32.9166435480 -03 34 53.793497208           ~ 1 0
43 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 1100 2
44 EGGR 150 WD* 21 52 25.3789636654 +02 23 19.576176425 11.942 12.732 12.743 12.839 12.938 DA2.8 195 0
45 V* EZ Aqr Er* 22 38 33.576000 -15 17 59.75700 15.762 14.33 12.38 12.12 8.677 M5V 304 1

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