SETI [Fwd: Two Jets from Protostar L1551-IRS5]


Robert Owen (rowen@technologist.com)
Wed, 22 Sep 1999 21:06:46 -0400


Larry Klaes wrote:

> >X-Mailer: Mozilla 3.0 (Win16; I)
> >Approved-By: "H. Alan Montgomery" <fhd@LCC.NET>
> >Newsgroups: sci.space.news
> >Date: Sun, 19 Sep 1999 22:52:47 -0700
> >Reply-To: fhd@lcc.net
> >Sender: News about Space from SEDS <SEDSNEWS@listserv.tamu.edu>
> >From: "H. Alan Montgomery" <fhd@lcc.net>
> >Organization: Master CraftsMon
> >Subject: Two Jets from Protostar L1551-IRS5
> >To: SEDSNEWS@listserv.tamu.edu
> >
> >Subject: Two Jets from Protostar L1551-IRS5 (Forwarded)
> >Date: Mon, 20 Sep 1999 02:57:44 GMT
> >From: Andrew Yee <ayee@nova.astro.utoronto.ca>
> >Organization: UTCC Campus Access
> >To: SEDSNEWS@listserv.tamu.edu
> >
> >Subaru Telescope
> >Hilo, Hawaii
> >
> >August 24, 1999
> >
> >PR-990824
> >
> >Two Jets from Protostar L1551-IRS5
> >
> >L1551-IRS5, which is about 450 light years away from the Earth, is believed
> >to be a binary system consisting of two protostars. (A protostar is a
> cloud of
> >gas which is collapsing prior to starting nuclear fusion at its core.) This
> >picture shows two parallel jets (green) being emitted from a nebula (white,
> >located slightly left of center), within which the protostars are located.
> >Observations with the Hubble Space Telescope had previously revealed the
> >two jets. However, the high resolution of the Subaru Telescope has allowed
> >them to be separated from the ground for the first time. Analysis has
> revealed
> >that the jets emit strongly in light produced by ionized iron. The jets are
> >thought to be produced separately by each of the protostars, and extend for
> >about 1500 AU. (1 AU, or Astronomical Unit, is the distance between the Earth
> >and the Sun: 93 million miles or 150 million km.)
> >
> >The white nebula is called an "infrared reflectance nebula", and it emits by
> >reflecting strong infrared light from the protostars. In addition, a strong
> >wind from the protostars blows ambient material away and evacuates a
> >cavity around the jets, and the edge of this cavity also reflects light from
> >the protostars. Jets are thought to be produced on both sides of a protostar;
> >in the case of L1551-IRS5, we can only see the jets pointed towards us
> >because the oppositely-directed jets are hidden by intervening, dusty
> >material.
> >
> >Object Name: Two Jets from Protostar L1551-IRS5
> >Telescope: Subaru Telescope / Cassegrain Focus
> >Instrument: CISCO
> >Filter: J (1.25 micron), K' (2.15 micron)
> >Color: Blue (J+K'), Green (J), Red (K')
> >Date: UT 1999 Jan 14
> >Exposure: 160 sec (J), 22.5 sec (K')
> >Field of View: about 1 arcmin
> >Orientation: North up, east left
> >Position: RA (J2000.0)=4h31m34s, DEC (J2000.0)=+18d8m5s (Taurus)
> >
> >[NOTE: Links to images are available at
> >http://www.naoj.org/outreach/press_releases/990824/index.html
> >or
> >http://www.subaru.naoj.org/outreach/press_releases/990824/index.html]
> >
> >---
> >Andrew Yee
> >ayee@nova.astro.utoronto.ca
> >
> ==
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--
=======================
Robert M. Owen
Director
The Orion Institute
57 W. Morgan Street
Brevard, NC 28712-3659 USA
=======================



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