by johnnydeep » Wed Jul 17, 2024 4:49 pm
VictorBorun wrote: ↑Wed Jul 17, 2024 10:21 am
johnnydeep wrote: ↑Tue Jul 16, 2024 6:51 pm
Since the text didn't make clear which one was CG30, I had to find another reference. From
https://astrodonimaging.com/gallery/com ... in-puppis/
CG30,31 is a cometary globule complex located in southern portion of the large Gum Nebula at RA 8hr 08min 50.5s and DEC -35d 50m 54s near the constellations of Vela and Puppis. Unlike the more famous nearby, cometary globule CG4, this is a complex of several globlues (CG30, CG31, CG38) and dark clouds. An annotated image is presented below (note – the main image is rotated 180 deg). The head of CG30 contains the bright Herbig-Haro object HH120 that is powered by a young star, CG 30-IRS4 based upon IR data. Distance estimates are 700-1300 light years. The image is ~42′ x 42′ and North is down.
Ref – B. Pettersson, "Young Stars and Dust Clouds in Puppis and Vela", p 54 in Handbook of Star Forming Regions, Vol 2. The Southern Sky, ed. B Reipurth, Astronomical Society of the Pacific, San Francisco, 2008.
https://astrodonimaging.com/wp-content/ ... 1Label.jpg
So, the red spot in the center of the large CG30 is a Herbig-Haro object, but why is the bright red glow the text refers to especially noteworthy? I seem to see the same red glow in the rims of the other CGs as well.
Cometary Globules (2024 Jul 16)..jpgCometary Globules (2024 Jul 16) 2.jpg
...
Herbig-Haro object HH120 must be the
small reddish glow near its head, a telltale sign of energetic jets from a star in the early stages of formation.
To my eye there are two HH iet pairs close to each other and parallel, too
I'd call HH120 the red dot
smack dab in the middle of the head of CG30, not "
near its head". But the other CGs sport reddish glows outlining their heads almost as much as CG30 does. I just find it odd to call out the reddish glow of CG30 as particularly noteworthy.
[quote=VictorBorun post_id=340309 time=1721211674 user_id=145500]
[quote=johnnydeep post_id=340297 time=1721155875 user_id=132061]
Since the text didn't make clear which one was CG30, I had to find another reference. From https://astrodonimaging.com/gallery/cometary-globules-cg30-cg31-in-puppis/
[quote]CG30,31 is a cometary globule complex located in southern portion of the large Gum Nebula at RA 8hr 08min 50.5s and DEC -35d 50m 54s near the constellations of Vela and Puppis. Unlike the more famous nearby, cometary globule CG4, this is a complex of several globlues (CG30, CG31, CG38) and dark clouds. An annotated image is presented below (note – the main image is rotated 180 deg). The head of CG30 contains the bright Herbig-Haro object HH120 that is powered by a young star, CG 30-IRS4 based upon IR data. Distance estimates are 700-1300 light years. The image is ~42′ x 42′ and North is down.
Ref – B. Pettersson, "Young Stars and Dust Clouds in Puppis and Vela", p 54 in Handbook of Star Forming Regions, Vol 2. The Southern Sky, ed. B Reipurth, Astronomical Society of the Pacific, San Francisco, 2008.[/quote]
[url]https://astrodonimaging.com/wp-content/uploads/2009/01/C31Label.jpg[/url]
So, the red spot in the center of the large CG30 is a Herbig-Haro object, but why is the bright red glow the text refers to especially noteworthy? I seem to see the same red glow in the rims of the other CGs as well.
[/quote]
[hide]Cometary Globules (2024 Jul 16)..jpgCometary Globules (2024 Jul 16) 2.jpg[/hide]
[imghover=https://asterisk.apod.com/download/file.php?id=50041&mode=view]https://asterisk.apod.com/download/file.php?id=50042&mode=view[/imghover]
Herbig-Haro object HH120 must be the [i]small reddish glow near its head, a telltale sign of energetic jets from a star in the early stages of formation.[/i]
To my eye there are two HH iet pairs close to each other and parallel, too
[/quote]
I'd call HH120 the red dot [b][i]smack dab in the middle [/i][/b]of the head of CG30, not "[b][i]near [/i][/b]its head". But the other CGs sport reddish glows outlining their heads almost as much as CG30 does. I just find it odd to call out the reddish glow of CG30 as particularly noteworthy.