AlH lines in the blue spectrum of Proxima Centauri
AlH lines in the blue spectrum of Proxima Centauri
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比邻星蓝色光谱中的 AlH 线
DOI:
10.1093/mnras/stac2588
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发表时间:
2022
影响因子:
4.8
通讯作者:
Pavlenko Y
中科院分区:
文献类型:
--
作者:
Pavlenko Y
The recently computed ExoMol line lists for isotopologues of AlH are used to analyse the blue spectrum (4000–4500 Å) of Proxima Cen (M5.5 V). Comparison of the observed and computed spectra enables the identification of a large number of27AlH lines of the A1Π –X1Σ+band system: The spectral range covering 1-0, 0-0, and 1-1 bands are dominated by clearly resolved AlH lines. We reveal the diffuse nature of transitions close to the dissociation limit which appears in the form of increasingly wider (up to 5 Å) and shallower (up to the continuum confusion limit) AlH line profiles. The predicted wavelengths of AlH diffuse lines are systematically displaced. The effect of broadening by predissociation states on the line profiles is included by increasing the radiative damping rate by up to 5 orders of magnitude. We determine empirical values of damping rates for a number of the clean 0-0 Q-branch transitions by comparing the observed and synthetic stellar spectra. We find excellent agreement between our damping rates and lifetimes available in the literature. A comparison of27Al1H ExoMol and REALH spectra shows that the observed spectrum is better described by the ExoMol line list. A search for26Al1H lines in the Proxima Cen spectrum does not reveal any notable features; giving an upper limit of27Al1H /26Al1H >100.
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DOI:
10.7566/jpscp.31.011056
发表时间:
2020
期刊:
International journal of radiation applications and instrumentation. Part B, Nuclear medicine and biology
影响因子:
--
作者:
S. Palmerini;M. Cognata;L. Acosta;R. Alba;E. Chávez;S. Cherubini;G. D’ Agata;A. Pietro;P. Figuera;K. D. L. Ríos;G. Guardo;M. Gulino;S. Hayakawa;G. Kiss;M. Commara;L. Lamia;C. Maiolino;G. Manicó;M. Mazzocco;J. Mrázek;C. Parascandalo;T. Petruze;D. Pierroutsakou;R. Pizzone;G. Rapisarda;S. Romano;D. Santonocito;R. Spartá;C. Spitaleri;A. Tumino
通讯作者:
A. Tumino
DOI:
10.1007/978-3-642-50754-0
发表时间:
1938
期刊:
International journal of radiation applications and instrumentation. Part B, Nuclear medicine and biology
影响因子:
--
作者:
A. Unsöld
通讯作者:
A. Unsöld
DOI:
10.1007/978-3-319-06956-2_4
发表时间:
2014
期刊:
International journal of radiation applications and instrumentation. Part B, Nuclear medicine and biology
影响因子:
--
作者:
R. Kurucz
通讯作者:
R. Kurucz
DOI:
10.1016/0021-9614(80)90157-3
发表时间:
1980
期刊:
The Journal of Chemical Thermodynamics
影响因子:
--
作者:
M. L. Mcglashan
通讯作者:
M. L. Mcglashan