as known since the infrared astronomical satellite (iras), a number of evolved giant stars show extended emission which proved most prominent at the 60 mic. wavelength and images of structures up to several arcminutes were obtained. we propose to observe with iso a sample of long period variable (lpv) stars for which hipparcos data should become available to us early in 1996 (pi and co-i have two proposals on this astrometric program). from known distances, we shall calibrate structures found with iso directly in u.a. or km, which is essential for their interpretation. we expect to deduce from these observations the morphology and magnitude of continuous or episodic mass loss of these stars. in the latter case, the history of events is important since it raises constraints on stellar evolution models. also, calibration of the mass loss rates from other methods is planned. the isocam infrared camera brings the unique opportunity of sensitive imaging at shorter wavelengths (we selected a raster mode in cam01 at 15-16 mic. to get the better possible contrast) and a 13-limit in resolution due to diffraction. in addition, a raster at 60 mic. will provide the large scale (8.x8.) structure and background. additional photometry of these variable stars is planned from 3.6 to 100 mic. a few symbiotic and peculiar stars were added to this program. if a moderate reduction is to be applied, stars priorities should be used. if drastic, the pht22 program of parts 2 and 4 should be deleted (900 s per star , 42% of total time) . note added on april 13th 1995 : we add a new object c65 with a grade 3 with aot.s in the four segments (proposals 555 666 777 888). there is no duplication with gt and these observations were not already proposed in a previous (rejected) proposal. if this new source cannot be accepted (for ex. on the grounds of duplication with open time) it should be replaced by c3313 which has been attributed grade 1 in the four proposals. note added on june 6th 1995 : 1.- grade 1 stars : they are to be ignored if all the grade 3 and 6 stars are kept in the final version. we describe below our policy for any change which could be asked to us in the future. in addition to c3313 (ion 24 & 69 in prop_555, ion 24 in prop_666 ion 33 & 78 in prop_777, ion 33 in prop_888), we have maintained four grade 1 stars which could replace grade 3 stars removed for any reason in the future : c4302 (ion 30 & 75 in prop_555, ion 30 in prop_666) should replace any c__, c___ or c____ target further deleted from the autumn list hic108928 (ion 11 & 56 in prop_555, ion 11 in prop_666) should replace any hic_____ or hic______ target further deleted from the autumn list c5228 (ion 36 & 81 in prop_777, ion 36 in prop_888) should replace any c__, c___ or c____ target further deleted from the spring list hic117078 (ion 14 & 59 in prop_777, ion 14 in prop_888) should replace any hic_____ or hic______ target further deleted from the spring list if the removed target is grade 6, please upgrade a grade 3 star c65 (ion 93 & 94 in prop_555, ion 42 in prop_666): autumn list or c65 (ion 97 e& 98 in pro_777, ion 43 in prop_888): spring list if this is a c-target, or hic110478 (ion 12 & 57 in prop_555, ion 12 in prop_666) : autumn l. or hic45058 (ion 8 & 53 in prop_777, ion 8 in prop_888) : spring l. if this is a hic-target; then upgrade a grade 1 star to replace the star upgraded from 3 to 6. if such a change proves necessary, please proceed globally upon the three ion.s of a given star: no partial replacement should be operated. 2.- due to increase in time costs, the photometry pht3 is restricted to three filters (usually 3.6, 16 and 25 mic.) for all stars except for the symbiotics r aqr, hm sge & v1016 cyg.
Instrument
CAM01 , PHT03 , PHT22
Temporal Coverage
1996-08-30T20:54:51Z/1997-02-07T09:53:41Z
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, BERGEAT et al., 1999, 'THE ENVIRONMENT OF COOL GIANT VARIABLES - PART 1 EXTENSIONS AND DETACHED SHELLS ON THE AGB - PART 1', 1.0, European Space Agency, https://doi.org/10.5270/esa-s0a5e09
