J/ApJS/270/13 Water fountain cand. from H2O masers (22.235GHz) (Fan+, 2024)
Systematic search for water fountain candidates using the databases of
circumstellar maser sources.
Fan H., Nakashima J.-I., Engels D., Zhang Y., Qiu J.-J., Feng H.-X.,
Xie J.-Y., Imai H., Hsia C.-H.
<Astrophys. J. Suppl. Ser., 270, 13 (2024)>
=2024ApJS..270...13F 2024ApJS..270...13F
ADC_Keywords: Masers; References; Stars, giant; Interstellar medium; Radio lines
Keywords: Circumstellar envelopes ; Circumstellar masers ;
Asymptotic giant branch ; Post-asymptotic giant branch stars
Abstract:
Water fountains (WFs) are thought to be objects in the morphological
evolution of the circumstellar envelopes of low- and intermediate-mass
evolved stars, transitioning from spherically symmetric to asymmetric
shapes. We used databases of circumstellar 1612MHz OH and 22.235GHz
H2O maser sources to search for new WF candidates using the criterion
of a larger velocity range of the H2O maser emission compared to that
of the OH maser emission. Thus, it is in principle possible to
identify WFs with H2O velocity ranges smaller than those for the
previously known WFs. For the OH maser line, we analyzed database
entries of 8474 observations from 2195 sources, and 6085 observations
from 3642 sources for the H2O maser line. After a close examination of
the velocity ranges and line profiles, we identified 11 sources that
meet the criterion mentioned above. We examined the IRAS colors of the
selected sources and found that two of them (IRAS 19069+0916 and
IRAS19319+2214) are in the color region for post-AGB stars. We find
that the maser velocity criterion can discover other astrophysically
interesting objects than just WFs. Such objects may include peculiar
planetary nebulae with maser emissions and stellar merger remnants.
Description:
As a source of information on OH maser sources, we used the catalog
from Engels & Bunzel (2015, J/A+A/582/A68). This database contains the
records of 13655 observations toward 2341 sources in the OH 1612,
1665, and 1667MHz lines. In the present analysis, we used only the
1612MHz line data, which consist of 8474 observations toward
6068 sources (2195 out of them are detected sources).
For the H2O 22.235GHz maser line, we used an unpublished database
compiled by the same authors. The version 0.1 of the database used for
our analysis contains records of 6085 observations toward 3642 sources
(890 of them are detected sources). See Section 2.3.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table6.dat 153 890 H2O (22.235GHz) maser source catalog (Appendix F)
refs.dat 76 65 References (see Appendix G)
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See also:
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
J/A+AS/90/327 : OH survey of IRAS point sources (te Lintel Hekkert+ 1991)
J/ApJS/89/189 : IRAS PSC new OH/IR stars. III. (Chengalur+ 1993)
J/A+AS/98/589 : IRAS Sources behind the Solar circle (Wouterloot+ 1993)
J/ApJS/93/549 : Arecibo 1612 MHz survey supplement (Lewis 1994)
J/A+AS/119/459 : Search for OH maser emission (te Lintel Hekkert+ 1996)
J/PASJ/53/517 : Water maser survey of late-type stars (Takaba+, 2001)
J/A+A/368/845 : Arcetri Cat. of H2O maser sources. (Valdettaro+, 2001)
J/AJ/123/2772 : OH-selected AGB and post-AGB objects. I. (Sevenster+, 2002)
J/A+A/391/967 : H2O & SiO masers in the Galactic center (Sjouwerman+, 2002)
J/PASJ/55/229 : SiO maser survey of cold IRAS sources (Nakashima+, 2003)
J/ApJS/155/595 : OH maser IRAS and MSX observations (Deacon+, 2004)
J/PASJ/56/765 : SiO maser survey of IRAS sources (Deguchi+, 2004)
J/ApJ/658/1096 : H2O maser classification (Deacon+, 2007)
J/A+A/470/957 : H-band images of IRAS 19312+1950 (Murakawa+, 2007)
J/ApJ/669/446 : Observations of SiO masers (Nakashima+, 2007)
J/PASJ/59/1185 : Water maser in galactic IRAS sources (Sunada+, 2007)
J/PASJ/62/391 : SiO and H2O masers in Stephenson 2 cluster (Deguchi+ 2010)
J/PASJ/62/525 : SiO maser survey off the Galactic Plane (Deguchi+, 2010)
J/MNRAS/416/1764 : H2O Southern Galactic Plane Survey (HOPS) (Walsh+, 2011)
J/ApJ/741/94 : VLBA obs. of H20 maser in IRAS 18286-0959 (Yung+, 2011)
J/AJ/144/129 : Known stellar SiO maser sources (Cho+, 2012)
J/PASJ/64/4 : SiO maser survey of nearby red variables (Deguchi+, 2012)
J/AJ/145/22 : Simultaneous SiO and H2O maser observations (Kim+, 2013)
J/ApJ/769/20 : 22GHz H2O maser survey toward IR sources (Yung+, 2013)
J/MNRAS/442/2240 : Accurate water maser positions from HOPS (Walsh+, 2014)
J/ApJS/211/15 : SiO & H2O maser survey toward AGB stars (Yoon+, 2014)
J/ApJ/794/81 : Maser and IR studies of oxygen-rich AGB stars (Yung+, 2014)
J/A+A/582/A68 : Database of circumstellar OH masers (Engels+, 2015)
J/A+A/578/A119 : Water maser emission toward post-AGB and PN (Gomez+, 2015)
J/A+A/642/A213 : SiO maser emission in evolved stars (Gomez-Garrido+, 2020)
J/MNRAS/505/6051 : Arecibo sample variability data (Jimenez-Esteban+, 2021)
Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [0/889] Row number
5- 21 A17 --- Name Name of observed source
23- 24 I2 h RAh Hour of right ascension of source (J2000)
26- 27 I2 min RAm Minute of right ascension of source (J2000)
29- 34 F6.3 s RAs Second of right ascension of source (J2000)
36 A1 --- DE- Sign of declination of source (J2000)
37- 38 I2 deg DEd Degree of declination of source (J2000)
40- 41 I2 arcmin DEm Arcminute of declination of source (J2000)
43- 47 F5.2 arcsec DEs Arcsecond of declination of source (J2000)
49- 50 I2 h RAWh ? Hour of RA of WISE counterpart (J2000)
52- 53 I2 min RAWm ? Minute of RA of WISE counterpart (J2000)
55- 58 F4.1 s RAWs ? Second of RA of WISE counterpart (J2000)
60 A1 --- DEW- Sign of DEC of WISE counterpart (J2000)
61- 62 I2 deg DEWd ? Degree of DEC of WISE counterpart (J2000)
64- 65 I2 arcmin DEWm ? Arcminute of DEC of WISE counterpart (J2000)
67- 68 I2 arcsec DEWs ? Arcsecond of DEC of WISE counterpart (J2000)
70- 75 F6.1 km/s Vmin [-342/209] Minimum H2O maser velocity of
source among all observations
77- 82 F6.1 km/s Vmax [-342/346] Maximum H2O maser velocity of
source among all observations
84- 88 F5.1 km/s Vmax-Vmin [0/541] Difference between maximum and
minimum velocity of source
90- 103 A14 --- ImgInsp ? Image inspection results
105- 146 A42 --- Ref Reference(s) for observations
(see refs.dat file)
148- 153 A6 --- r_Pos Reference of the observed position
(see refs.dat file)
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Byte-by-byte Description of file: refs.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 A6 --- Code Reference code
8- 34 A27 --- Auth First author's name(s)
36- 54 A19 --- BibCode Bibcode of the reference
56- 76 A21 --- Cat VizieR catalog reference
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 27-Feb-2024