J/ApJS/94/749 RI photometry of cool dwarfs (Kirkpatrick+ 1994)
The luminosity function at the end of the main sequence:
results of a deep, large-area, CCD survey for cool dwarfs.
Kirkpatrick J.D., McGraw J.T., Hess T.R., Liebert J., McCarthy Jr D.W.
<Astrophys. J. Suppl. Ser. 94, 749 (1994)>
=1994ApJS...94..749K 1994ApJS...94..749K
ADC_Keywords: Stars, dwarfs ; Photometry, RI ; Stars, late-type
Keywords: stars: low-mass, brown dwarfs -
stars: luminosity function, mass function
Abstract:
The luminosity function at the end of the main sequence is determined
from V, R, and I data taken by the CCD/Transit Instrument (CTI), a
dedicated telescope surveying an 8.25' wide strip of sky centered at
δ=+28°, thus sampling Galactic latitudes of +90° down to
-35°. A selection of 133 objects chosen via R-I and V-I colors has
been observed spectroscopically at the 4.5m Multiple Mirror Telescope
to assess contributions by giants and subdwarfs and to verify that the
reddest targets are objects of extremely late spectral class. Eighteen
dwarfs of type M6 or later have been discovered, with the latest being
of type M8.5. Data used for the determination of the luminosity
function cover 27.3°2 down to a completeness limit of R=19.0.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 97 133 CTI objects observed spectroscopically
table5.dat 98 60 Stars from the NLTT catalog (Cat. I/98) that
should be in the CTI strip
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See also:
I/98 : NLTT Catalogue (Luyten, 1979)
J/AJ/106/773 : Mass-luminosity relation (Henry+, 1993)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- CTI CTI name
16 A1 --- n_CTI [AB:+] Note on CTI (1)
18- 19 I2 h RAh Right ascension (1950)
21- 22 I2 min RAm Right ascension (1950)
24- 27 F4.1 s RAs Right ascension (1950)
29 A1 --- DE- Declination sign (1950)
30- 31 I2 deg DEd Declination (1950)
33- 34 I2 arcmin DEm Declination (1950)
36- 37 I2 arcsec DEs Declination (1950)
40- 44 F5.2 mag Rmag ? CTI R magnitude
45 A1 --- u_Rmag Uncertainty flag on Rmag
46- 49 F4.2 mag R-I ? CTI (R-I) colour index
51- 54 F4.2 mag e_R-I ? rms uncertainty on R-I
55 A1 --- u_R-I Uncertainty flag on R-I
57- 60 F4.2 mag V-I ? CTI (V-I) colour index
62- 65 F4.2 mag e_V-I ? rms uncertainty on V-I
66 A1 --- u_V-I Uncertainty flag on V-I
68- 75 A8 --- SpType Spectral type
77- 84 A8 "DD/MM/YY" Date Observation date (UT)
85- 87 A3 --- Date2 Second day when there is an interval
90- 93 I4 s Int Integration time
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Note (1): AB: Multiplicity index on CTI
":" Uncertainty flag
+: Also discovered as proper motion objects by Luyten (1979),
who obtained µ=0.180"/yr for CTI 135347.7+280419 and
µ=0.186"/yr for CTI 141111.3+280141, confirming our by-eye
estimate of µ∼0.2"/yr
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name Object name
13- 16 F4.1 mag mr Red magnitude (1)
18- 21 F4.1 mag mpg Photographic magnitude (1)
23- 25 A3 --- col Luyten's color class
27- 30 F4.3 arcsec/yr pm Total proper motion
32- 33 I2 h RAh Right ascension (1987.5) (2)
35- 36 I2 min RAm Right ascension (1987.5) (2)
38- 41 F4.1 s RAs Right ascension (1987.5) (2)
42 A1 --- DE- Declination sign (1987.5)
43- 44 I2 deg DEd Declination (1987.5) (2)
46- 47 I2 arcmin DEm Declination (1987.5) (2)
49- 50 I2 arcsec DEs Declination (1987.5) (2)
52- 66 A15 --- CTI CTI name
67 A1 --- n_CTI [cd] Note (3)
69 A1 --- l_Rmag Limit flag on Rmag
70- 74 F5.2 mag Rmag ? CTI R (or V if n_Rmag=V) magnitude
75 A1 --- n_Rmag [V] V: CTI V magnitude in Rmag column
77- 81 F5.2 mag R-I ? CTI R-I colour index
83- 85 F3.2 mag e_R-I ? rms uncertainty on R-I
87- 98 A12 --- Note Notes
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Note (1): Magnitudes as listed in the NLTT catalogue (Cat. I/98).
Note (2): Predicted coordinates for epoch and equinox 1987.5.
Note (3): c: In Table 1.
d: Luyten 1979 (Cat. I/98) appears to have overestimated this
object's proper motion. The CTI star listed in the table has been
confirmed from CTI images to be the proper motion object
(LP 323-25 = LHS 2723) in question.
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History:
* 24-Jun-1997: Prepared via OCR at CDS (Table 5).
* 24-Jan-2000: Added Table 1.
(End) James Marcout, Patricia Bauer [CDS] 24-Jan-2000