PACS and SPIRE range spectroscopy of cool, evolved stars

Abstract

Context: At the end of their lives AGB stars are prolific producers of dust and gas. The details of this mass-loss process are still not understood very well. Herschel PACS and SPIRE spectra offer a unique way of investigating properties of AGB stars in general and the mass-loss process in particular. Methods: The HIPE software with the latest calibration is used to process the available PACS and SPIRE spectra of 40 evolved stars. The spectra are convolved with the response curves of the PACS and SPIRE bolometers and compared to the fluxes measured in imaging data of these sources. Custom software is used to identify lines in the spectra, and to determine the central wavelengths and line intensities. Standard molecular line databases are used to associate the observed lines. Because of the limited spectral resolution of the spectrometers several known lines are typically potential counterparts to any observed line. To help identifications the relative contributions in line intensity of the potential counterpart lines are listed for three characteristic temperatures based on LTE calculations and assuming optically thin emission. Result: The following data products are released: the reduced spectra, the lines that are measured in the spectra with wavelength, intensity, potential identifications, and the continuum spectra, i.e. the full spectra with all identified lines removed. As simple examples of how this data can be used in future studies we have fitted the continuum spectra with three power laws and find that the few OH/IR stars seem to have significantly steeper slopes than the other oxygen- and carbon-rich objects in the sample. As another example we constructed rotational diagrams for CO and fitted a two-component model to derive rotational temperatures.

arXiv commentA&A accepted

References in corpus (75)

• The chemical composition of the Sun
• Validation of the new Hipparcos reduction
• Herschel Space Observatory - An ESA facility for far-infrared and submillimetre astronomy
• The Photodetector Array Camera and Spectrometer (PACS) on the Herschel Space Observatory
• The Herschel-SPIRE instrument and its in-flight performance
• Trigonometric Parallaxes of High Mass Star Forming Regions: the Structure and Kinematics of the Milky Way
• Hi-GAL: the Herschel infrared Galactic Plane Survey
• Evolution, nucleosynthesis and yields of AGB stars at different metallicities (III): intermediate mass models, revised low mass models and the ph-FRUITY interface
• Stellar yields from metal-rich asymptotic giant branch models
• Hi-GAL, the Herschel infrared Galactic Plane Survey: photometric maps and compact source catalogues. First data release for Inner Milky Way: +68°> l > -70°
• Probing the mass-loss history of AGB and red supergiant stars from CO rotational line profiles - II. CO line survey of evolved stars: derivation of mass-loss rate formulae
• Dust formation in the oxygen-rich AGB star IK Tau
• Models of circumstellar molecular radio line emission: Mass loss rates for a sample of bright carbon stars
• A far-infrared survey of bow shocks and detached shells around AGB stars and red supergiants
• Red supergiants as potential Type IIn supernova progenitors: Spatially resolved 4.6 micron CO emission around VY CMa and Betelgeuse
• Mass loss rates of a sample of irregular and semiregular M-type AGB-variables
• `Thermal' SiO radio line emission towards M-type AGB stars: a probe of circumstellar dust formation and dynamics
• Probing the mass-loss history of AGB and red supergiant stars from CO rotational line profiles I. Theoretical model -- Mass-loss history unravelled in VY CMa
• Molecular abundances in the inner layers of IRC +10216
• MESS (Mass-loss of Evolved StarS), a Herschel Key Program
• A Detailed Analysis of the Dust Formation Zone of IRC+10216 Derived from Mid-IR Bands of C2H2 and HCN
• Warm water vapour in the sooty outflow from a luminous carbon star
• The abundance of HCN in circumstellar envelopes of AGB stars of different chemical types
• Circumstellar molecular line emission from S-type AGB stars: Mass-loss rates and SiO abundances
• Circumstellar water vapour in M-type AGB stars: Radiative transfer models, abundances and predictions for HIFI
• The enigmatic nature of the circumstellar envelope and bow shock surrounding Betelgeuse as revealed by Herschel. I. Evidence of clumps, multiple arcs, and a linear bar-like structure
• Dust-enshrouded Asymptotic Giant Branch Stars in the Solar Neighbourhood
• New observations and models of circumstellar CO line emission of AGB stars in the Herschel SUCCESS programme
• PO and PN in the wind of the oxygen-rich AGB star IK Tau
• A high resolution line survey of IRC+10216 with Herschel. First results: Detection of warm silicon dicarbide SiC2
• The millimeter IRAM-30m line survey toward IK Tau
• Molecular abundances in carbon-rich circumstellar envelopes
• The abundance of SiS in circumstellar envelopes around AGB stars
• SiO in C-rich circumstellar envelopes of AGB stars: effects of non-LTE chemistry and grain adsorption
• Water content and wind acceleration in the envelope around the oxygen-rich AGB star IK Tau as seen by Herschel/HIFI
• The wind of W Hya as seen by Herschel - I. The CO envelope
• Sulphur molecules in the circumstellar envelopes of M-type AGB stars
• The Astrosphere of the Asymptotic Giant Branch Star Irc+10216
• Evolved star water maser cloud size determined by star size
• The 12CO/13CO ratio in AGB stars of different chemical type-Connection to the 12C/13C ratio and the evolution along the AGB
• A HIFI view on circumstellar H2O in M-type AGB stars: radiative transfer, velocity profiles, and H2O line cooling
• Carbon and oxygen isotopic ratios for nearby miras
• An independent distance estimate to CW Leo
• Detailed modelling of the circumstellar molecular line emission of the S-type AGB star W Aquilae
• Discovery of multiple dust shells beyond 1 arcmin in the circumstellar envelope of IRC+10216 using Herschel/PACS
• Chemical content of the circumstellar envelope of the oxygen-rich AGB star R Dor: Non-LTE abundance analysis of CO, SiO, and HCN
• Large-scale environments of binary AGB stars probed by Herschel - I. Morphology statistics and case studies of R Aquarii and W Aquilae
• The detached dust shells of AQ And, U Ant, and TT Cyg
• Nucleosynthesis in AGB stars traced by oxygen isotopic ratios. I - Determining the stellar initial mass by means of the ${}^{17}$O/${}^{18}$O ratio
• The variable mass loss of the AGB star WX Psc as traced by the CO J=1-0 through 7-6 lines and the dust emission
• On the physical structure of IRC+10216. Ground-based and Herschel observations of CO and CCH
• Herschel PACS and SPIRE imaging of CW Leo
• A Molecular Line Survey of the Highly Evolved Carbon Star CIT 6
• Near-infrared observations of water-ice in OH/IR stars
• OH/IR stars and their superwinds as observed by the Herschel Space Observatory
• Atomic Carbon in the Envelopes of Carbon-Rich Post-AGB Stars
• Circumstellar molecular composition of the oxygen-rich AGB star IK Tau: I. Observations and LTE chemical abundance analysis
• PACS and SPIRE Spectroscopy of the Red Supergiant VY CMa
• 28 SiO v=0 J=1-0 emission from evolved stars
• The wind of W Hya as seen by Herschel. II. The molecular envelope of W Hya
• SiO masers from AGB stars in the vibrationally excited v=1,v=2, and v=3 states
• Herschel/PACS observations of the 69 $\mu m$ band of crystalline olivine around evolved stars
• Herschel SPIRE and PACS observations of the red supergiant VY CMa: analysis of the molecular line spectra
• H2O vapor excitation in dusty AGB envelopes. A PACS view of OH 127.8+0.0
• The problematically short superwind of OH/IR stars - Probing the outflow with the 69 μm spectral band of forsterite
• Water isotopologues in the circumstellar envelopes of M-type AGB stars
• Constraints on the H2O formation mechanism in the wind of carbon-rich AGB stars
• Sculpting an AGB Mass-Loss Envelope into a Bipolar Planetary Nebula: High-Velocity Outflows in V Hydrae
• The detached dust shells around the carbon AGB stars R Scl and V644 Sco
• Connecting the evolution of thermally pulsing asymptotic giant branch stars to the chemistry in their circumstellar envelopes -- I. The case of hydrogen cyanide
• Large-scale environments of binary AGB stars probed by Herschel. II: Two companions interacting with the wind of pi1 Gruis
• Detection of CI line emission towards the oxygen-rich AGB star omi Cet
• Dusty shells surrounding the carbon variables S Scuti and RT Capricorni
• THROES: a caTalogue of HeRschel Observations of Evolved Stars. I. PACS range spectroscopy
• Detection of CI line emission from the detached CO shell of the AGB star R Sculptoris

Cited by in corpus (4)

• ATOMIUM: Halide molecules around the S-type AGB star W Aquilae
• How to disentangle geometry and mass-loss rate from AGB-star spectral energy distributions -- The case of EP Aqr
• Vibrationally excited HCN transitions in circumstellar envelopes of carbon-rich AGB stars
• Warm CO in evolved stars from the THROES catalogue. II. Herschel/PACS spectroscopy of C-rich envelopes