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LEW01 - The Approaching Death of the OH/IR star IRAS 18455+0448

Short title: Lewis et al. (2001)
Authors: Lewis, B. M. Oppenheimer, B. D. Daubar, I. J.
Journal: The Astrophysical Journal, Volume 548, Issue 1, pp. L77-L80.
Bibcode:

Abstract
1612 MHz observations of the OH/IR star IRAS 18455+0448 in 1998 June showed that its peak intensity had faded by a factor of 20 from its 2.09 Jy discovery intensity in 1988. Its peak intensity, when observed at constant resolution, has faded exponentially since by a further factor of 10, with an e-folding time of 319 days. This decline is seemingly inexorable, even though the main line OH masers are as yet largely unaffected, as the correlation between the expansion velocities and periods of OH/IR stars suggests a likely period of ~400 days for 18455+0448 as a long-period variable, and our observations cover 706 days. We argue that extant data are best understood if we are witnessing an early stage in the expansion of a fossil circumstellar shell around 18455+0448, prior to it becoming a planetary nebula.	Comments: Spectral type was set to: ""S"", where only one peak was found. ""D"", where two peaks were found. Velocity resolution: 0.22 and 0.44 km/s

Abstract

1612 MHz observations of the OH/IR star IRAS 18455+0448 in 1998 June showed that its peak intensity had faded by a factor of 20 from its 2.09 Jy discovery intensity in 1988. Its peak intensity, when observed at constant resolution, has faded exponentially since by a further factor of 10, with an e-folding time of 319 days. This decline is seemingly inexorable, even though the main line OH masers are as yet largely unaffected, as the correlation between the expansion velocities and periods of OH/IR stars suggests a likely period of ~400 days for 18455+0448 as a long-period variable, and our observations cover 706 days. We argue that extant data are best understood if we are witnessing an early stage in the expansion of a fossil circumstellar shell around 18455+0448, prior to it becoming a planetary nebula.

Comments:
Spectral type was set to:
""S"", where only one peak was found.
""D"", where two peaks were found.

Velocity resolution: 0.22 and 0.44 km/s

Input tables: Table 1 and 2
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Detection table from Lewis et al. (2001)

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ID	Obs. RA	Obs. Dec	l	b	Group id	Source name	Frequency	V_range	V_peak	F_peak	List	Detection	Class	Dist. (parallax)	Ref.
	(J2000)	(J2000)	(deg.)	(deg.)			(MHz)	(km/s)	(km/s)	(Jy)		Yes/No		(kpc)
1	18 48 2.1	+04 51 29	36.8722	2.9683	G36.873+2.968	IRAS 18455+0448	1612	27.8	27.8	0.040	ENG15	+H₂O +OH	EVOLVED		LEW01
	18 48 2.1	+04 51 29	36.8722	2.9683	G36.873+2.968	IRAS 18455+0448	1665	12.5	27.9	0.454	ENG15	+H₂O +OH	EVOLVED		LEW01
	18 48 2.1	+04 51 29	36.8722	2.9683	G36.873+2.968	IRAS 18455+0448	1667	12.6	27.7	0.733	ENG15	+H₂O +OH	EVOLVED		LEW01

DSS colored	2MASS colored	WISE colored
SDSS color	IRAC color I1,I2,I4	GLIMPSE 360
PACS color (70-160 um)	SPIRE color (250-500 um)	NVSS (1.4GHz)
ATLASGAL 870 um	ATLASGAL 870 um + Planck	Bolocam 1.1 mm
UKIDSS K Download UKIDSS K FITS	2MASS K Download 2MASS K FITS

select MAX(oh_data_all.ra_hms) as ra_hms,MAX(oh_data_all.dec_dms) as dec_dms,MAX(oh_data_all.source_name) as source_name,MAX(oh_data_all.ra) as ra,MAX(oh_data_all.dec) as dec,MAX(oh_data_all.l) as l,MAX(oh_data_all.b) as b,MAX(oh_data_all.grp) as grp,MAX(oh_data_all.other_name) as other_name,MAX(oh_data_all.other_desc) as other_desc,BOOL_OR(thermal) as thermal,MAX(oh_data_all.freq) as freq,MAX(oh_data_all.vrange) as vrange,MAX(oh_data_all.vpeak) as vpeak,MAX(oh_data_all.peak) as peak,MAX(oh_data_all.fwhm) as fwhm,MAX(oh_data_all.int) as int,MAX(oh_data_all.rms) as rms,MAX(oh_data_all.units) as units,MAX(oh_data_all.units_rms) as units_rms,MAX(oh_data_all.date_txt) as date_txt,MAX(oh_data_all.telescope_ref) as telescope_ref,MAX(oh_data_all.telescope_conf) as telescope_conf,MAX(oh_data_all.v_step) as v_step,MAX(oh_data_all.beam) as beam,MAX(oh_data_all.beam_maj) as beam_maj,MAX(oh_data_all.beam_min) as beam_min,MAX(oh_data_all.beam_pa) as beam_pa,MAX(oh_data_all.ref) as ref,MAX(oh_data_all.list_ref) as list_ref,MAX(oh_data_all.ascii) as ascii,MAX(oh_data_all.url) as url,MAX(oh_data_all.image) as image,MAX(oh_data_all.image2) as image2,MAX(oh_data_all.image3) as image3,MAX(oh_data_all.descr) as descr,MAX(oh_data_all.id) as id,BOOL_OR(mjy_flag) as mjy_flag,BOOL_OR(rms_mjy_flag) as rms_mjy_flag,MAX(oh_data_all.dist) as dist,1 as dist_parallax,MAX(oh_data_all.date_txt) as date_txt,MAX(line_det) as line_det,MAX(type) as type,MAX(simbad_types_cat) as simbad_types_cat FROM oh_data_all  LEFT JOIN all_objects_withmet ON oh_data_all.grp=all_objects_withmet.group_name LEFT JOIN object_categories ON all_objects_withmet.group_name = object_categories.group_name_cat AND object_categories.tbl_cat = 'all_objects_withmet' LEFT JOIN transitions ON oh_data_all.line=transitions."Line"  WHERE ref ilike 'LEW01' AND detected=true AND hide=false GROUP BY ref

select oh_data_all.ra_hms,oh_data_all.dec_dms,oh_data_all.source_name,oh_data_all.ra,oh_data_all.dec,oh_data_all.l,oh_data_all.b,oh_data_all.grp,oh_data_all.other_name,oh_data_all.other_desc,oh_data_all.thermal,oh_data_all.freq,oh_data_all.vrange,oh_data_all.vpeak,oh_data_all.peak,oh_data_all.fwhm,oh_data_all.int,oh_data_all.rms,oh_data_all.units,oh_data_all.units_rms,oh_data_all.date_txt,oh_data_all.telescope_ref,oh_data_all.telescope_conf,oh_data_all.v_step,oh_data_all.beam,oh_data_all.beam_maj,oh_data_all.beam_min,oh_data_all.beam_pa,oh_data_all.ref,oh_data_all.list_ref,oh_data_all.ascii,oh_data_all.url,oh_data_all.image,oh_data_all.image2,oh_data_all.image3,oh_data_all.descr,oh_data_all.id,oh_data_all.mjy_flag,oh_data_all.rms_mjy_flag,oh_data_all.dist,oh_data_all.dist_parallax,oh_data_all.date_txt,line_det,type,simbad_types_cat FROM oh_data_all   LEFT JOIN all_objects_withmet ON oh_data_all.grp=all_objects_withmet.group_name LEFT JOIN object_categories ON all_objects_withmet.group_name = object_categories.group_name_cat AND object_categories.tbl_cat = 'all_objects_withmet' LEFT JOIN transitions ON oh_data_all.line=transitions."Line"  WHERE ref ilike 'LEW01' AND detected=true AND hide=false ORDER BY detected DESC,id

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LEW01 - The Approaching Death of the OH/IR star IRAS 18455+0448

View as list of objects

Detection table from Lewis et al. (2001)