2017A&A...599A..74M


C.D.S. - SIMBAD4 rel 1.7 - 2020.04.04CEST08:00:56

2017A&A...599A..74M - Astronomy and Astrophysics, volume 599A, 74-74 (2017/3-1)

Measuring diffuse interstellar bands with cool stars - Improved line lists to model background stellar spectra.

MONREAL-IBERO A. and LALLEMENT R.

Abstract (from CDS):

Context. Diffuse stellar bands (DIBs) are ubiquitous in stellar spectra. Traditionally, they have been studied through their extraction from hot (early-type) stars because of their smooth continuum. In an era in which there are several ongoing or planned massive Galactic surveys using multi-object spectrographs, cool (late-type) stars constitute an appealing set of targets. However, from the technical point of view, the extraction of DIBs in their spectra is more challenging because of the complexity of the continuum.
Aims. In this contribution we provide the community with an improved set of stellar lines in the spectral regions associated with the strong DIBs at λ6196.0, λ6269.8, λ6283.8, and λ6379.3. These lines allow for the creation of better stellar synthetic spectra, reproducing the background emission and a more accurate extraction of the magnitudes associated with a given DIB (e.g., equivalent width, radial velocity).
Methods. The Sun and Arcturus were used as representative examples of dwarf and giant stars, respectively. A high quality spectrum for each of them was modeled using TURBOSPECTRUM and the Vienna Atomic Line Database (VALD) stellar line list. The oscillator strength log (gf) and wavelength of specific lines were modified to create synthetic spectra in which the residuals in both the Sun and Arcturus were minimized.
Results. The TURBOSPECTRUM synthetic spectra, based on improved line lists, reproduce the observed spectra for the Sun and Arcturus in the mentioned spectral ranges with greater accuracy. Residuals between the synthetic and observed spectra are always ≲10%, which is much better than residuals with previously existing options. We tested the new line lists with some characteristic spectra from a variety of stars, including both giant and dwarf stars, and under different degrees of extinction. As occurred with the Sun and Arcturus, residuals in the fits used to extract the DIB information are smaller when using synthetic spectra made with the updated line lists. Tables with the updated parameters are provided to the community.

Abstract Copyright: © ESO, 2017

Journal keyword(s): ISM: lines and bands - ISM: structure - stars: late-type - stars: late-type

Status at CDS:  

Simbad objects: 9

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Number of rows : 9

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 2682 159 * 08 51 27.8885891317 +11 55 40.949719456 14.598 13.94 13.320   12.625 G1IV 33 0
2 Cl* NGC 2682 ES III-9 * 08 51 27.9474785266 +11 50 11.919029103 15.180 15.08 14.491   13.669 G4V 33 0
3 NGC 2682 164 RG* 08 51 28.9911734176 +11 50 33.129974313   11.675 10.441 10.250 9.46 K1III 113 0
4 NGC 2682 266 RG* 08 51 59.5227988109 +11 55 04.837738790   11.65 10.463   9.490 ~ 69 0
5 Cl* IC 4651 AMC 4226 * 17 24 43.4558015480 -50 01 01.274579314           ~ 15 0
6 IC 4651 17 * 17 24 48.0970124432 -49 55 47.356510983   15.250 14.545     ~ 13 0
7 NGC 6705 1184 * 18 51 02.0072599526 -06 17 26.534320896   13.030 11.426     ~ 25 0
8 GES J18510358-0616112 * 18 51 03.5895146085 -06 16 11.213349671   13.320 11.902     ~ 16 0
9 NGC 6705 OpC 18 51 05 -06 16.2   6.32 5.8     ~ 352 0

    Equat.    Gal    SGal    Ecl

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2020.04.04-08:00:56

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