A dataset provided by the European Space Agency

Name OT2_jcernich_8
Title A search for far-infrared HCN lasers in C-rich evolved stars
URL

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DOI https://doi.org/10.5270/esa-rawtllj
Author cernicharo, j.
Description The pumping mechanisms for astrophysical masers are often complex, involving infrared
line opacities, collisions, and infrared line overlaps. Hence, the interpretation of the
observed emission requires detailed modelling. In spite of these
potential problems the masering lines can, however, give useful
information on the physical conditions of the regions where the masers are
produced, i.e., the innermost zones of circumstellar envelopes.

While SiO, OH, and H2O masers are a common feature of O-rich stars
and were detected more than forty years ago, strong maser emission in
C-rich stars has been detected only in some vibrational lines
of HCN, and in some high-J lines of the ground state of SiS.

In the line survey of IRC+10216 with HIFI we have discovered several
lasers involving the pair of vibrational levels 4v2/v2+v1. The strongest
ones are above 1 THz and carry information of the 1-3 stellar
radii zone. Several masers have been also found in some lines of the v2
bending mode between 500 and 900 GHz.

We would like to carry a systematic search for HCN masers in C-rich
evolved stars by observing selected frequency ranges covering from
the v1 to the 3v2 vibrational states (typically a range of 15-20 GHz)
for each rotational line within the SIS receivers of HIFI (from J=6-5
up to J=13-12). The pummping mechanism can be different in each object
depending on the dust opacity. High mass loss rate stars will have
their 3 micron emission absorbed near the star by the large amount of
dust produced in these objects. The pumping of HCN will be done mainly
through the bending mode at 14 microns. However, in low mass loss rate
the 3 micron photons will populate the v1, v3 and combination bands allowing
a much complex pumping pattern.

This study will permit to characterize HCN laser emission in C-rich stars
and their pu...mping mechanisms. It will also complement our recently granted high angular
resolution observations of HCN with ALMA in cycle 0.
Publication
Instrument HIFI_HifiFS_freq
Temporal Coverage 2012-05-03T20:23:28Z/2012-11-30T22:48:27Z
Version SPG v14.2.0
Mission Description Herschel was launched on 14 May 2009! It is the fourth 'cornerstone' mission in the ESA science programme. With a 3.5 m Cassegrain telescope it is the largest space telescope ever launched. It is performing photometry and spectroscopy in approximately the 55-671 µm range, bridging the gap between earlier infrared space missions and groundbased facilities.
Creator Contact https://support.cosmos.esa.int/h®erschel/
Date Published 2013-05-30T22:12:35Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, cernicharo, j., 2013, OT2_jcernich_8, SPG v14.2.0, European Space Agency, https://doi.org/10.5270/esa-rawtllj