|Herschel photometry of WISE J180956.27-330500.2; a newly discovered AGB star undergoing episodic mass ejection
|We propose to carry out imaging photometry of WISE J180956.27-330500.2 (hereafter WISE J1810) using PACS (at 70, 110, 160 micron) and SPIRE (at 250, 350, 500 micron) in order to obtain the latest far-IR and sub-mm fluxes of the object and constrain the nature of its mass-loss history. WISE J1810 was discovered very recently by us (Gandhi et al. 2012) as an object with a peculiar 2MASS--WISE spectral energy distribution (SED). We propose that the object is an asymptotic giant branch (AGB) star presently experiencing an episodic mass-loss event following a thermal pulse. If this is the case, it is the first opportunity of real-time observation of AGB mass ejection at thermal pulse. The infrared SED of this object is rapidly evolving over the past 15 years and updated observations over a broad wavelength range are essential. Herschel is the only available facility with the capability of high-sensitivity, high-spatial resolution observations at far-infrared and sub-mm wavelengths, and can provide indispensable information of the rapidly expanding dust shell of this object. The unique nature of this source, its recent bright appearance and rapid evolution prompt us to request a DDT observation while Herschel is still operating. The requested observing time is 1414 sec, which is the minimum operation time for the observing modes that will be used.
|Herschel was launched on 14 May 2009! It is the fourth 'cornerstone' mission in the ESA science programme. With a 3.5 m Cassegrain telescope it is the largest space telescope ever launched. It is performing photometry and spectroscopy in approximately the 55-671 µm range, bridging the gap between earlier infrared space missions and groundbased facilities.
|Publisher And Registrant
|European Space Agency
|European Space Agency, 2013, DDT_yamamura_1, SPG v14.2.0. https://doi.org/10.5270/esa-j0tlstf