J/ApJS/142/79 1-1.4 micron spectral atlas of stars (Malkan+, 2002)
1-1.4 micron spectral atlas of stars.
Malkan M.A., Hicks E.K., Teplitz H.I., McLean I.M., Sugai H., Guichard J.
<Astrophys. J. Suppl. Ser. 142, 79 (2002)>
=2002ApJS..142...79M 2002ApJS..142...79M
ADC_Keywords: Infrared sources ; Equivalent widths ; Effective temperatures
Keywords: infrared: stars - line: identification - stars: fundamental parameters
Abstract:
We present a catalog of J-band (1.08 to 1.35µm) stellar spectra at
low resolution (R∼400). The targets consist of 105 stars ranging in
spectral type from O9.5 to M7 and luminosity classes I through V. The
relatively featureless spectra of hot stars, earlier than A4, can be
used to remove the atmospheric features which dominate ground-based
J-band spectroscopy. We measure equivalent widths for three absorption
lines and nine blended features which we identify in the spectra.
Using detailed comparison with higher resolution spectra, we
demonstrate that low-resolution data can be used for stellar
classification, since several features depend on the effective
temperature and gravity. For example, the CN index (1.096-1.104µm)
decreases with temperature, but the strength of a blended feature at
1.28µm (consisting of primarily Pβ) increases. The slope of a
star's spectrum can also be used to estimate its effective
temperature. The luminosity class of a star correlates with the ratio
of the MgI (1.1831µm) line to a blend of several species at
1.16µm. Using these indicators, a star can be classified to within
several subclasses. Fifteen stars with particularly high and low metal
abundances are included in the catalog, and some spectral dependence
on metal abundance is also found.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 50 105 J-Band atlas stars
table3.dat 109 105 *Equivalent widths of each line/blend
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Note on table3.dat: table sorted in the same order as table1
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name HR (V/50) or HD (III/135) name
13- 27 A15 --- SpType MK spectral type
28- 32 I5 K Teff Effective temperature
34- 43 A10 "YYYY/DD/MM" Date Date of observation
45- 50 F6.3 [Sun] [Fe/H] ? Metallicity from Cayrel de Strobel
et al., 1997, Cat. III/200
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name HR (V/50) or HD (III/135) name
12- 22 A11 --- SpType MK spectral type
24- 28 F5.2 0.1nm EWP3 ? Paschen γ (1.0942µm)
equivalent width
29 A1 --- u_EWP3 Uncertainty flag on EWpgamma
30 A1 --- f_EWP3 [ab] Problem on EWpgamma (1)
32- 36 F5.2 0.1nm EWCN0-0 ? Equivalent width on CN 0-0 index
(10960-11040 Å)
37 A1 --- u_EWCN0-0 ? rms uncertainty on EWCN0-0
39- 42 F4.2 0.1nm EW1.16um ? Equivalent width on 1.16µm blend
43 A1 --- u_EW1.16um ? rms uncertainty on EW1.16um
44 A1 --- f_EW1.16um [ab] Problem on EW1.16 (1)
46- 49 F4.2 0.1nm EW1.17um ? Equivalent width on 1.17µm blend
50 A1 --- u_EW1.17um ? rms uncertainty on EW1.17um
51 A1 --- f_EW1.17um [ab] Problem on EW1.17 (1)
53- 56 F4.2 0.1nm EWMgI ? Equivalent width on MgI (1.1831µm) line
57 A1 --- u_EWMgI ? rms uncertainty on EWMgI
58 A1 --- f_EWMgI [ab] Problem on EWMgI (1)
60- 63 F4.2 0.1nm EW1.19um ? Equivalent width on 1.19µm blend
64 A1 --- u_EW1.19um ? rms uncertainty on EW1.19um
65 A1 --- f_EW1.19um [ab] Problem on EW1.19 (1)
67- 70 F4.2 0.1nm EW1.20um ? Equivalent width on 1.20µm blend
71 A1 --- u_EW1.20um ? rms uncertainty on EW1.20um
72 A1 --- f_EW1.20um [ab] Problem on EW1.20 (1)
74- 78 F5.2 0.1nm EWSiI ? Equivalent width on SiI (1.2034µm) line
79 A1 --- u_EWSiI ? rms uncertainty on EWSiI
80 A1 --- f_EWSiI [ab] Problem on EWSiI (1)
82- 85 F4.2 0.1nm EW1.21um ? Equivalent width on 1.21µm blend
86 A1 --- u_EW1.21um ? rms uncertainty on EW1.21um
87 A1 --- f_EW1.21um [ab] Problem on EW1.21 (1)
89- 93 F5.2 0.1nm EW1.28um ? Equivalent width on 1.28µm blend
94 A1 --- u_EW1.28um ? rms uncertainty on EW1.28um
95 A1 --- f_EW1.28um [b] Problem on EW1.28 (1)
97-100 F4.2 0.1nm EW1.31um ? Equivalent width on 1.31µm blend
101 A1 --- u_EW1.31um ? rms uncertainty on EW1.31um
102 A1 --- f_EW1.31um [ab] Problem on EW1.31 (1)
104-108 F5.2 0.1nm EW1.33um ? Equivalent width on 1.33µm blend (2)
109 A1 --- u_EW1.33um rms uncertainty on EW1.33um
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Note (1): Notes as follows:
a = three sigma upper limit.
b = wavelength off by more than 8Å
Note (2): The FWHM was fixed at 35Å and the core depth is reported
rather than equivalent width.
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History:
From electronic version of the journal
(End) Patricia Bauer [CDS] 24-Sep-2002