J/A+A/589/A80 APOGEE strings (Hacar+, 2016)
APOGEE strings: A fossil record of the gas kinematic structure.
Hacar A., Alves J., Forbrich J., Meingast S., Kubiak K., Grossschedl J.
<Astron. Astrophys., 589, A80 (2016)>
=2016A&A...589A..80H 2016A&A...589A..80H (SIMBAD/NED BibCode)
ADC_Keywords: YSOs ; Radial velocities
Keywords: stars: formation - stars: kinematics and dynamics -
ISM: kinematics and dynamics
Abstract:
We compare APOGEE radial velocities (RVs) of young stars in the Orion
A cloud with CO line gas emission and find a correlation between the
two at large scales in agreement with previous studies. However, at
smaller scales we find evidence for the presence of a substructure in
the stellar velocity field. Using a friends-of-friends approach we
identify 37 stellar groups with almost identical RVs. These groups are
not randomly distributed, but form elongated chains or strings of
stars with five or more members with low velocity dispersion across
lengths of 1-1.5pc. The similarity between the kinematic properties
of the APOGEE strings and the internal velocity field of the chains of
dense cores and fibers recently identified in the dense interstellar
medium is striking and suggests that for most of the Orion A cloud,
young stars keep memory of the parental gas substructure where they
originated.
Description:
We used archival APOGEE multiobject spectrograph radial velocity data
for the Orion A cloud.
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* *
* Sorry, but the author(s) never supplied the tabular material *
* (full table A2) announced in the paper. *
* The tables available in this catalogue were taken directly *
* from the published version. *
* *
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 55 37 APOGEE strings: main properties
tablea2.dat 53 10 *APOGEE strings: individual sources (first 10 lines)
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Note on tablea2.dat: the complete table of 757 entries never supplied by
the author.
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- StringID APOGEE string identification bumber
4- 10 F7.3 deg GLON String center Galactic longitude
12- 18 F7.3 deg GLAT String center Galactic latitude
20- 22 I3 --- Nmemb Numbe of members
24- 27 F4.2 --- fYSO fraction of YSOs (i.e., APOGEE sources with
Spitzer and/or XMM counterparts) per string
29- 31 F3.1 pc L Total length
33- 36 F4.2 km/s DeltaVmax Maximum velocity difference within a string
38- 41 F4.2 km/s sigma Internal velocity dispersion per string
43- 46 F4.2 pc <Dnear> Mean distance of the nearest member of the
string
48- 55 A8 --- Region Region name
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- APOGEE APOGEE designation (2MHHMMSSss+DDMMSSs)
20- 26 F7.3 deg GLON Galactic longitude
28- 34 F7.3 deg GLAT Galactic latitude
36- 41 F6.3 km/s Vlsr LSR velocity
43- 47 F5.3 km/s e_Vlsr rms uncertainty on Vlsr
49- 51 I3 --- StringID String ID (as in tablea1.dat)
53 A1 --- YSO? [Y/N] Source with Spitzer and/or
XMM counterpart?
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 25-Jul-2016