1999ApJ...526L..17H

Query : 1999ApJ...526L..17H

1999ApJ...526L..17H - Astrophys. J., 526, L17-L20 (1999/November-3)

Constraints on the space density of methane dwarfs and the substellar mass function from a deep near-infrared survey.

HERBST T.M., THOMPSON D., FOCKENBROCK R., RIX H.-W. and BECKWITH S.V.W.

Abstract (from CDS):

We report preliminary results of a deep near-infrared search for methane-absorbing brown dwarfs; almost 5 yr after the discovery of Gl 229b, there are only a few confirmed examples of this type of object. New J-band, wide-field images, combined with preexisting R-band observations, allow efficient identification of candidates by their extreme (R-J) colors. Follow-up measurements with custom filters can then confirm objects with methane absorption. To date, we have surveyed a total of 11.4 deg2 to J∼20.5 and R∼25. Follow-up CH4 filter observations of promising candidates in one-fourth of these fields have turned up no methane-absorbing brown dwarfs. With 90% confidence, this implies that the space density of objects similar to Gl 229b is less than 0.012 pc–3. These calculations account for the vertical structure of the Galaxy, which can be important for sensitive measurements. Combining published theoretical atmospheric models with our observations sets an upper limit of α≤0.8 for the exponent of the initial mass function power law in this domain.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: Stellar Content - Infrared: Stars - Stars: Low-Mass, Brown Dwarfs - Surveys

Simbad objects: 1

goto Full paper

goto View the references in ADS

Number of rows : 1
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 HD 42581B BD* 06 10 34.80 -21 52 00.0           T6.5 549 0

Query : 1999ApJ...526L..17H

Basic data :
HD 42581B -- Brown Dwarf
Other object types: otypes_help 		* (CNS5,GJ,...), ** (2024ApJ,**,...), BD* (1999ApJ), Rad ([B2006])
ICRS coord. (ep=J2000) : 		06 10 34.80 -21 52 00.0 [ ] C 2009AJ....137....1F
FK4 coord. (ep=B1950 eq=1950) : 		06 08 28.33 -21 50 42.7 [ ]
Gal coord. (ep=J2000) : 		228.61456 -18.43930 [ ]
Proper motions mas/yr : 		-137.0 -714.1 [0.9 0.6 0] D 2009AJ....137....1F
Parallaxes (mas): 		173.19 [1.12] C 2012ApJ...752...56F
Spectral type: 		T6.5 C 2000ApJ...531L..57B
Fluxes (3) :
J 14.01 [0.05] C 2012ApJ...752...56F
H 14.36 [0.05] C 2012ApJ...752...56F
K 14.36 [0.05] C 2012ApJ...752...56F
SIMBAD within arcmin
Overlay Simbad points in this preview
Back
All CDSPortal (CDSPortal)
Send to sendBySAMP sendBySAMP
sedIcon
within arcsec sed-help-icon

Identifiers (7) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

** NAJ 1B GJ 229 B 8pc 173.19B [B2006] J061035.1-215117
CNS5 1529 HD 42581B WDS J06106-2152B

References (549 between 1850 and 2026) (Total 549)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
Follow new references on this object
                Reference summaries :

                from: to:

                 or select by : (not exhaustive, explanation here)

Collections of Measurements Description of Measurements

Distance : 2    Plx : 1    SpT : 6   

   

Observing logs
Herschel : 2   

   

External archives :

Link by name to the catalogue in VizieR :

GJ 229 B HD 42581B WDS J06106-2152B

Search by coordinates in Vizier (radius: 15 arcsec)

Annotations :
Annotations allow a user to add a note or report an error concerning the astronomical object and its data. It requires registration to post a note. See description .
Please, have a look at Best practices. The list of all annotations to SIMBAD objects can be found here .

The annotation server is currently not available. Sorry for any inconvenience

To bookmark this query, right click on this link: simbad:objects in 1999ApJ...526L..17H and select 'bookmark this link' or equivalent in the popup menu