A dataset provided by the European Space Agency

Name HVFLOW
Title SPECTROSCOPIC OBSERVATIONS OF HIGH-VELOCITY FLOW OF EVOLVED OBJECTS
URL

http://nida.esac.esa.int/nida-sl-tap/data?RETRIEVAL_TYPE=OBSERVATION&PRODUCT_LEVEL=ALL&obsno=724004150
DOI https://doi.org/10.5270/esa-bz0a4gw
Author YAMAMURA, ISSEI
Description we propose an observation of the high-velocity outflow of evolved objects with mid- and far-infrared atomic / ionic lines by sws and lws. the high-velocity outflows in the circumstellar envelope of evolved stars have been discovered mostly by radio molecular line observations. the velocity of the wind often exceeds 100km/s. many of the objects are so called proto-planetary nebulae which lie between the agb and planetary nebula phase. the mechanism of acceleration of the high-velocity wind has still not been understood. the purpose of the present observation is to clarify the physical conditions of the high-velocity flow and contiguous region in the envelope. the region is thought to be near the central star and the gas temperature is high. atomic and ionic lines in mid- and far-infrared are good tracers of such warm gas. in addition, shocks between the high-velocity wind and the surrounding slowly expanding envelope play an important role to determine the physical conditions in the region, such as excitation or destruction of the molecules. these lines will provide us important information about this phenomenon. our goal is to construct an unique model of the circumstellar envelope including the high-velocity outflow. two spectrometers, sws and lws with fabry-perot are used in the observations. a total observation time of 23422sec is requested for the autumn launch and 24089sec for the spring launch.
Instrument LWS01 , LWS03 , SWS07
Temporal Coverage 1997-05-16T02:12:01Z/1997-11-09T01:48:50Z
Version 1.0
Mission Description The Infrared Space Observatory (ISO) was the worlds first true orbiting infrared observatory. Equipped with four highly-sophisticated and versatile scientific instruments, it was launched by Ariane in November 1995 and provided astronomers world-wide with a facility of unprecedented sensitivity and capabilities for a detailed exploration of the Universe at infrared wavelengths.
Creator Contact https://support.cosmos.esa.int/iso/
Date Published 1998-12-02T00:00:00Z
Last Update 2026-03-02
Keywords Infrared Space Observatory data, ESA ISO mission dataset, ISO infrared observations, mid-infrared astronomy data, far-infrared spectroscopy dataset, ISOCAM imaging data, ISOPHOT photometry data, SWS short wavelength spectrometer data, LWS long wavelength spectrometer data, infrared spectral line observations, infrared imaging survey data, dust emission infrared observations, star formation infrared dataset, interstellar medium spectroscopy data, polycyclic aromatic hydrocarbons PAH features data, active galactic nuclei infrared observations, circumstellar envelope infrared data, planetary nebula infrared spectroscopy, extragalactic infrared survey data, calibrated ISO data products, FITS files infrared astronomy, spectral energy distribution infrared data, continuum photometry dataset, infrared spectral cubes, flux-calibrated infrared maps, ESA ISO Data Archive, legacy infrared space mission dataset
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, YAMAMURA et al., 1998, 'SPECTROSCOPIC OBSERVATIONS OF HIGH-VELOCITY FLOW OF EVOLVED OBJECTS', 1.0, European Space Agency, https://doi.org/10.5270/esa-bz0a4gw