2013A&A...559A..43G


Query : 2013A&A...559A..43G

2013A&A...559A..43G - Astronomy and Astrophysics, volume 559A, 43-43 (2013/11-1)

Towards a complete stellar mass function of the Hyades. I. Pan-STARRS1 optical observations of the low-mass stellar content.

GOLDMAN B., ROESER S., SCHILBACH E., MAGNIER E.A., OLCZAK C., HENNING T., JURIC M., SCHLAFLY E., CHEN W.P., PLATAIS I., BURGETT W., HODAPP K., HEASLEY J., KUDRITZKI R.P., MORGAN J.S., PRICE P.A., TONRY J.L. and WAINSCOAT R.

Abstract (from CDS):

The Hyades cluster is an ideal target to study the dynamical evolution of a star cluster over the entire mass range due to its intermediate age and proximity to the Sun. We wanted to extend the Hyades mass function towards lower masses down to 0.1M and to use the full three-dimensional spatial information to characterize the dynamical evolution of the cluster. We performed a kinematic and photometric selection using the PPMXL and Pan-STARRS1 sky surveys, to search for cluster members up to 30pc from the cluster centre. We determined our detection efficiency and field star contamination rate to derive the cluster luminosity and mass functions down to masses of 0.1M. The thorough astrometric and photometric constraints minimized the contamination. A minimum spanning tree algorithm was used to quantify the mass segregation. We discovered 43 new Hyades member candidates with velocity perpendicular to the Hyades motion up to 2km/s. They have mass estimates between 0.43 and 0.09M, for a total mass of 10M. This doubles the number of Hyades candidates with masses smaller than 0.15M. We provide an additional list of 11possible candidates with velocity perpendicular to the Hyades motion up to 4km/s. The cluster is significantly mass segregated. The extension of the mass function towards lower masses provided an even clearer signature than estimated in the past. We also identified as likely Hyades member an L0 dwarf previously assumed to be a field dwarf. Finally we question the membership of a number of previously published candidates, including a L2.5-type dwarf.

Abstract Copyright:

Journal keyword(s): open clusters and associations: individual: Hyades - stars: luminosity function, mass function - stars: low-mass - stars: individual: 2MASSI J0230155+270406 - stars: individual: 2MASS J05233822-1403022

VizieR on-line data: <Available at CDS (J/A+A/559/A43): table6.dat>

Nomenclature: [GRS2013] NNNNNNNN N=62 among (Nos 1221246-99624511).

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 21

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Number of rows : 21
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 2MASS J02301551+2704061 LM* 02 30 15.5301425880 +27 04 06.161275524           M9.4V 15 0
2 LP 245-52 PM* 02 34 29.5443695688 +36 13 11.013101220   19.3   17.0   M6V 11 0
3 SIPS J0235-0711 LM* 02 35 49.5920205528 -07 11 21.113473992   21.0   17.78 14.463 M7V 14 0
4 M 77 GiP 02 42 40.7091669408 -00 00 47.859690204 9.70 9.61 8.87 10.1 9.9 ~ 4425 2
5 LP 591-256 LM* 03 04 02.0608672392 +00 45 51.164454168   19.0 15.44 16.5 14.4 M6+D 26 0
6 LP 356-770 LM* 03 30 05.0997403728 +24 05 28.062407292   19.3 18.54 17.3 15.3 M7e 19 0
7 Cl Melotte 22 OpC 03 46 24 +24 06.8           ~ 3279 0
8 LP 413-53 LM* 03 50 57.3984540384 +18 18 06.725620584   21.3   19.2   M9.0V 24 0
9 LSPM J0354+2316 LM* 03 54 01.3873238304 +23 16 33.803659056   21.4   18.7   M7.9V 14 0
10 2MASS J04110642+1247481 ** 04 11 06.42288 +12 47 48.1668           M6 9 0
11 HG 8-80 PM* 04 20 47.9740363920 +15 14 09.304933920   15.43   13.88   M4.0V 32 0
12 LP 415-19 BD? 04 21 44.3704046400 +20 24 10.453768992           ~ 16 0
13 LP 415-20 LM* 04 21 49.5764748384 +19 29 08.566062612           M7+M9.5 42 0
14 LP 415-881 LM* 04 26 19.0455455928 +17 03 02.161156140   20.25 18.00     M7V 20 0
15 2MASS J04273708+2056389 * 04 27 37.2043905024 +20 56 38.238180720   20.0   18.2 16.0 M5.75v 5 0
16 * tet01 Tau SB* 04 28 34.4960341 +15 57 43.849432 5.510 4.780 3.840 5.48   G9IIIFe-0.5 481 0
17 Cl Melotte 25 OpC 04 29 47 +16 56.9           ~ 2928 0
18 LP 415-212 PM* 04 38 58.4891118744 +15 39 41.220181800   20.57 18.69     M5.5e 16 0
19 2MASS J04441479+0543573 LM* 04 44 14.7952624488 +05 43 57.357804396           M7.9V 7 0
20 2MASS J05233822-1403022 BD* 05 23 38.2236232872 -14 03 02.017758240           L2.5 58 0
21 NGC 2632 OpC 08 40 13 +19 37.3           ~ 1449 0

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2023.01.30-23:10:18

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