Detection of anhydrous hydrochloric acid, HCl, in IRC+10216 with the
  Herschel SPIRE and PACS spectrometers
  We report on the detection of anhydrous hydrochloric acid (hydrogen chlorine,
HCl) in the carbon-rich star IRC+10216 using the spectroscopic facilities
onboard the Herschel satellite. Lines from J=1-0 up to J=7-6 have been
detected. From the observed intensities, we conclude that HCl is produced in
the innermost layers of the circumstellar envelope with an abundance relative
to H2 of 5x10^-8 and extends until the molecules reach its photodissociation
zone. Upper limits to the column densities of AlH, MgH, CaH, CuH, KH, NaH, FeH,
and other diatomic hydrides have also been obtained.
