scientific abstract the purpose of this proposal is to study circumstellar dust, building on the iras discoveries by extending measurements to longer wavelengths, improving resolution, and to interpret the iras data through mapping observations. a wide variety of stars are nominated for observation by isophot, since many types of star have been found to have circumstellar dust, either as disks or shells. isophot gives us the opportunity to investigate the structure of the dust around these stars, using multi-aperture and mapping observations, and to investigate deviations of the energy distribution from that expected from a black-body with long wavelength multi-filter observations. spectra will be taken of all the brighter stars, to look for dust features. observation summary the proposal is split into three parts, this is part 3. it is planned to obtain more accurate coordinates for the sources in this proposal. the background positions used for the multi-aperture photometry may be updated later. the times used in this proposal are calculated using the cookbook. p22 is executed with 4 filters for 32s integration time, c_60, c_100, c_135, c_200. p04 is executed at 60um for 32s for all stars, and the background field has 64s integration time. p40 is executed with 32 second integration. nir photometry uses the 7.3, 10.0, 12.8, 16.0 filters. the diffraction limited aperture at the longest wavelength observed is used. 51 oph uses nir, 25, 60, 100 um with pht03 (chopped) 51 oph uses c_60, c_70, c_100 with pht22 (chopped) 09371+1212, hd213985, hd97048: use rectangular chopping in pht22 p cyg does pht04 at 60um and then at 16um for 32s, then observes the background in both filters for 64s integration 09371+1212, 16342-3814 are observed with nir filters using pht03, chopped hr4049 uses 64s integration in pht22, chopped
Instrument
PHT03 , PHT04 , PHT22 , PHT40
Temporal Coverage
1996-02-09T04:38:43Z/1997-02-16T20:35:36Z
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.
European Space Agency, WALKER et al., 1999, 'Disks and shells around post-main-sequence stars comma Part 3 ', 1.0, European Space Agency, https://doi.org/10.5270/esa-ukvgxbm
