J/A+A/600/A129 DIBs in APOGEE telluric standard star spectra (Elyajouri+, 2017)
Near-infrared diffuse interstellar bands in APOGEE telluric standard star
spectra. Weak bands and comparisons with optical counterparts.
Elyajouri M., Lallement R., Monreal-Ibero A., Capitanio L., Cox N.L.J.
<Astron. Astrophys. 600, A129 (2017)>
=2017A&A...600A.129E 2017A&A...600A.129E (SIMBAD/NED BibCode)
ADC_Keywords: Interstellar medium ; Equivalent widths
Keywords: infrared: ISM - infrared: stars - ISM: lines and bands -
dust, extinction - ISM: general
Abstract:
Information on the existence and properties of diffuse interstellar
bands (DIBs) outside the optical domain is still limited. Additional
infra-red (IR) measurements and IR-optical correlative studies are
needed to constrain DIB carriers and locate various absorbers in 3D
maps of the interstellar matter.
We extended our study of H-band DIBs in Apache Point Observatory
Galactic Evolution Experiment (APOGEE) Telluric Standard Star (TSS)
spectra. We used the strong λ15273 band to select the most and
least absorbed targets. We used individual spectra of the former
subsample to extract weaker DIBs, and we searched the two stacked
series for differences that could indicate additional bands.
High-resolution NARVAL and SOPHIE optical spectra for a subsample of
55 TSS targets were additionally recorded for NIR/optical correlative
studies.
From the TSS spectra we extract a catalog of measurements of the
poorly studied λλ15617, 15653, and 15673 DIBs in ∼300
sightlines, we obtain a first accurate determination of their rest
wavelength and constrained their intrinsic width and shape. In
addition, we studied the relationship between these weak bands and the
strong λ15273 DIB.We provide a first or second confirmation of
several other weak DIBs that have been proposed based on different
instruments, and we add new constraints on their widths and locations.
We finally propose two new DIB candidates.
We compared the strength of the λ15273 15273 absorptions with
their optical counterparts λλ5780, 5797, 6196, 6283, and
6614. Using the 5797-5780 ratio as a tracer of shielding against the
radiation field, we showed that the λ15273 DIB carrier is
significantly more abundant in unshielded (σ-type) clouds, and
it responds even more strongly than the λ5780 band carrier to
the local ionizing field.
Description:
A subset of ∼60 target stars from the APOGEE TSS list described in
Sect. 3 has been observed in the visible with NARVAL, the
spectropolarimeter of the Bernard Lyot telescope (2m) at Pic du Midi
observatory, used in high-resolution spectroscopic mode (R~=80000).
For all data the signal-to-noise ratio (S/N) is between 50 and 100.
Two targets were observed twice in order check the estimated
uncertainties. An additional subset of five targets was observed with
the SOPHIE spectrograph at the 1.93m telescope of the Haute-Provence
Observatory at a resolving power R~=39000.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 97 308 Equivalent widths and central wavelengths of the
λλ15617, 15653, and 15673 DIBs
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See also:
II/149 : Diffuse Interstellar Band Measurements (Snow+ 1977)
J/A+A/550/A108 : DIB in VLT-FLAMES Tarantula Survey (van Loon+, 2013)
J/A+A/555/A25 : Equivalent widths of DIBs (Puspitarini+, 2013)
J/ApJ/774/72 : 19 DIBs and 8 other interstellar lines (Kos+, 2013)
J/ApJS/225/19 : SDSS-III APOGEE spectra DIBs measurements (Elyajouri+, 2006)
J/MNRAS/463/2653 : 8620 DIB equivalent width and extinction (Damineli+, 2016)
Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- 2MASS 2MASS name (JHHMMSSss+DDMMSSs)
19- 24 F6.2 deg GLON Galactic longitude
26- 32 F7.3 deg GLAT Galactic latitude
34- 35 I2 0.1pm EW15617 ?=- DIB equivalent width at 15617Å
37- 39 I3 0.1pm e_EW15617 ?=- rms uncertainty on EW15617
41- 43 I3 0.1pm EW15653 ? DIB equivalent width at 15653Å
45- 47 I3 0.1pm e_EW15653 ? rms uncertainty on EW15653
49- 51 I3 0.1pm EW15673 ?=- DIB equivalent width at 15673Å
53- 54 I2 0.1pm e_EW15673 ?=- rms uncertainty on EW15673
56- 62 F7.1 0.1nm lc15617 ?=- Central wavelength of 15617 DIB (1)
64- 66 F3.1 0.1nm e_lc15617 ?=- rms uncertainty on lc15617
68- 74 F7.1 0.1nm lc15653 ?=- Central wavelength of 15653 DIB (1)
76- 78 F3.1 0.1nm e_lc15653 ?=- rms uncertainty on lc15653
80- 86 F7.1 0.1nm lc15673 ?=- Central wavelength of 15673 DIB (1)
88- 90 F3.1 0.1nm e_lc15673 ?=- rms uncertainty on lc15673
92- 97 F6.2 km/s RV Radial velocity
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Note (1): The wavelengths are in the APOGEE stellar frame and can be converted
into heliocentric wavelengths using the stellar radial velocity listed in the
last column.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 10-Apr-2017