J/ApJS/151/313 Optical spectra in star-forming regions (Pan+, 2004)
Cloud structure and physical conditions in star-forming regions from optical
observations. I. Data and component structure.
Pan K., Federman S.R., Cunha K., Smith V.V., Welty D.E.
<Astrophys. J. Suppl. Ser., 151, 313-343 (2004)>
=2004ApJS..151..313P 2004ApJS..151..313P
ADC_Keywords: Interstellar medium ; Associations, stellar ; Abundances
Keywords: ISM: clouds - ISM: molecules - ISM: structure - stars: formation
Abstract:
We present high-resolution optical spectra (at ∼0.6-1.8km/s) of
interstellar CN, CH, CH+, CaI, KI, and CaII absorption toward 29 lines
of sight in three star-forming regions, ρ Oph, Cep OB2, and
Cep OB3. The observations and data reduction are described. The
agreement between earlier measurements of the total equivalent widths
and our results is quite good. However, our higher resolution spectra
reveal complex structure and closely blended components in most lines
of sight. The velocity component structure of each species is obtained
by analyzing the spectra of the six species for a given sight line
together. The tabulated column densities and Doppler parameters of
individual components are determined by using the method of profile
fitting. Total column densities along lines of sight are computed by
summing results from profile fitting for individual components and are
compared with column densities from the apparent optical depth method.
A more detailed analysis of these data and their implications will be
presented in a companion paper.
Description:
Spectra were acquired at two sites. Brighter stars were observed with
the 0.9m Coude Feed Telescope at Kitt Peak National Observatory
(KPNO), while fainter stars were observed with the 2.7m telescope at
McDonald Observatory of the University of Texas at Austin. Data on
three stars, Oph A, HD 203374A, and HD 206773, were obtained at both
sites, thereby providing a check on consistency. Additional
observations of stars in Cep OB2 were obtained with the Sandiford
echelle spectrograph on the 2.1m telescope at McDonald Observatory.
Interstellar spectra for 12 program stars were obtained at KPNO during
four runs in 1995 (September 28-October 5), 1996 (September 4-5), 1999
(October 30-November 8), and 2000 (September 9-12).
Twenty stars were observed with the 2dcoude spectrograph (cs21) on the
2.7m telescope during three runs in 2000 (September 3-8) and 2001
(July 7-13; August 29-31).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 73 390 Component Measurements of Interstellar Lines
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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- 8 A8 --- Name Star name
9 A1 --- m_Name [ABCD] Multiplicity index on Name
11 A1 --- f_Name [cde] Flag on Name (1)
13- 17 F5.1 km/s VLSR Average Local Standard of Rest velocity
19- 23 F5.2 10+12cm-2 N(CN) ? Column density of CN component
25- 27 F3.1 km/s b(CN) ? b-value (line width) of CN component
29- 32 F4.1 10+12cm-2 N(CH) ? Column density of CH component
34- 36 F3.1 km/s b(CH) ? b-value (line width) of CH component
38- 41 F4.1 10+12cm-2 N(CH+) ? Column density of CH+ component
43- 45 F3.1 km/s b(CH+) ? b-value (line width) of CH+ component
47- 50 F4.1 10+9cm-2 N(CaI) ? Column density of Ca I component
52- 54 F3.1 km/s b(CaI) ? b-value (line width) of Ca I component
56- 59 F4.1 10+11cm-2 N(KI) ? Column density of K I component
61- 63 F3.1 km/s b(KI) ? b-value (line width) of K I component
65- 68 F4.1 10+11cm-2 N(CaII) Column density of Ca II component
70- 72 F3.1 km/s b(CaII) b-value (line width) of Ca II component
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Note (1): Flags on Name are defined as follows:
c = No available CH+ and Ca I data for this line of sight.
d = Ca II components at VLSR←40km/s are not included.
e = No available CH and CH+ data for this line of sight.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 07-May-2004