A collimated molecular jet in W 43A traced by water maser emission.

Hiroshi Imai; Tetsuo Sasao; Kumiko Obara; Toshihiro Omodaka; Philip J. Diamond

A collimated molecular jet in W 43A traced by water maser emission.

Hiroshi Imai, Tetsuo Sasao, Kumiko Obara, Toshihiro Omodaka, Philip J. Diamond

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

We present VLBA observations of the spatial and velocity distributions of 22 GHz H2O and 1612 MHz OH masers in the OH/IR star W 43A. These masers have the same systemic velocity and are, therefore, likely to be assocd. with the common stellar object. However, the kinematical structures of them are quite different and independent. Most of the H2O masers are extremely collimated spatially and kinematically. The H2O maser jet also seems to be processing. On the other hand, the OH masers exhibit clear arc-shaped structures indicating a spherically-expanding shell with weak collimation. The W 43A jet is very likely to be predominantly composed of hot mols. traced by H2O maser emission and formed in the immediate vicinity of an unknown star next to another OH/IR star. Such a mol. jet is likely to appear only during the short period before a star forms an elongated planetary nebula. [on SciFinder (R)]

Original language	English
Title of host publication	Symposium - International Astronomical Union
Volume	209
Publication status	Published - 2003

Keywords

Red giants (collimated mol. jet in W 43A traced by water and OH maser emission); Jets; Masers (cosmic; collimated mol. jet in W 43A traced by water and OH maser emission)

Cite this

@inproceedings{2705cba8531c4574bb309705e8cb091f,

title = "A collimated molecular jet in W 43A traced by water maser emission.",

abstract = "We present VLBA observations of the spatial and velocity distributions of 22 GHz H2O and 1612 MHz OH masers in the OH/IR star W 43A. These masers have the same systemic velocity and are, therefore, likely to be assocd. with the common stellar object. However, the kinematical structures of them are quite different and independent. Most of the H2O masers are extremely collimated spatially and kinematically. The H2O maser jet also seems to be processing. On the other hand, the OH masers exhibit clear arc-shaped structures indicating a spherically-expanding shell with weak collimation. The W 43A jet is very likely to be predominantly composed of hot mols. traced by H2O maser emission and formed in the immediate vicinity of an unknown star next to another OH/IR star. Such a mol. jet is likely to appear only during the short period before a star forms an elongated planetary nebula. [on SciFinder (R)]",

keywords = "Red giants (collimated mol. jet in W 43A traced by water and OH maser emission); Jets; Masers (cosmic; collimated mol. jet in W 43A traced by water and OH maser emission)",

author = "Hiroshi Imai and Tetsuo Sasao and Kumiko Obara and Toshihiro Omodaka and Diamond, {Philip J.}",

year = "2003",

language = "English",

volume = "209",

booktitle = "Symposium - International Astronomical Union",

}

TY - GEN

T1 - A collimated molecular jet in W 43A traced by water maser emission.

AU - Imai, Hiroshi

AU - Sasao, Tetsuo

AU - Obara, Kumiko

AU - Omodaka, Toshihiro

AU - Diamond, Philip J.

PY - 2003

Y1 - 2003

N2 - We present VLBA observations of the spatial and velocity distributions of 22 GHz H2O and 1612 MHz OH masers in the OH/IR star W 43A. These masers have the same systemic velocity and are, therefore, likely to be assocd. with the common stellar object. However, the kinematical structures of them are quite different and independent. Most of the H2O masers are extremely collimated spatially and kinematically. The H2O maser jet also seems to be processing. On the other hand, the OH masers exhibit clear arc-shaped structures indicating a spherically-expanding shell with weak collimation. The W 43A jet is very likely to be predominantly composed of hot mols. traced by H2O maser emission and formed in the immediate vicinity of an unknown star next to another OH/IR star. Such a mol. jet is likely to appear only during the short period before a star forms an elongated planetary nebula. [on SciFinder (R)]

AB - We present VLBA observations of the spatial and velocity distributions of 22 GHz H2O and 1612 MHz OH masers in the OH/IR star W 43A. These masers have the same systemic velocity and are, therefore, likely to be assocd. with the common stellar object. However, the kinematical structures of them are quite different and independent. Most of the H2O masers are extremely collimated spatially and kinematically. The H2O maser jet also seems to be processing. On the other hand, the OH masers exhibit clear arc-shaped structures indicating a spherically-expanding shell with weak collimation. The W 43A jet is very likely to be predominantly composed of hot mols. traced by H2O maser emission and formed in the immediate vicinity of an unknown star next to another OH/IR star. Such a mol. jet is likely to appear only during the short period before a star forms an elongated planetary nebula. [on SciFinder (R)]

KW - Red giants (collimated mol. jet in W 43A traced by water and OH maser emission); Jets; Masers (cosmic; collimated mol. jet in W 43A traced by water and OH maser emission)

M3 - Conference contribution

VL - 209

BT - Symposium - International Astronomical Union

ER -

A collimated molecular jet in W 43A traced by water maser emission.

Abstract

Keywords

Fingerprint

Cite this