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Posted: **Tue Jul 16, 2024 4:05 am**

Cometary Globules

Explanation: What are these unusual interstellar structures? Bright-rimmed, flowing shapes gather near the center of this rich starfield toward the borders of the nautical southern constellations Pupis and Vela. Composed of interstellar gas and dust, the grouping of light-year sized cometary globules is about 1300 light-years distant. Energetic ultraviolet light from nearby hot stars has molded the globules and ionized their bright rims. The globules also stream away from the Vela supernova remnant which may have influenced their swept-back shapes. Within them, cores of cold gas and dust are likely collapsing to form low mass stars, whose formation will ultimately cause the globules to disperse. In fact, cometary globule CG 30 (on the upper left) sports a small reddish glow near its head, a telltale sign of energetic jets from a star in the early stages of formation.

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Posted: **Tue Jul 16, 2024 5:00 am**

Oh, the Hattifatteners of the Moomin Valley who are always trying to reach the horizon have finally made it to the borders of Puppis and Vela!

: Hattifatteners.

: Cometary globules. Recent research suggests that they may be hattifatteners. Credit: Mark Hanson & Martin Pugh, Observatorio El Sauce

I'll leave it to the rest of you to talk more about these cometary globules, apart from the hattifatteners nature.

Ann

Posted: **Tue Jul 16, 2024 5:26 am**

The Celestial Moray Choir singing their hearts out?

Posted: **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.

Posted: **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.

...

: Click to view full size image 1 or image 2

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

Posted: **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
...
Click to view full size image 1 or image 2
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.

Posted: **Fri Jul 19, 2024 2:39 pm**

johnnydeep wrote: ↑Wed Jul 17, 2024 4:49 pm 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.

zoom in and see the jets of HH120 for all their noteworth

Posted: **Fri Jul 19, 2024 3:49 pm**

VictorBorun wrote: ↑Fri Jul 19, 2024 2:39 pm
johnnydeep wrote: ↑Wed Jul 17, 2024 4:49 pm 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.
zoom in and see the jets of HH120 for all their noteworth

I don't know. The so-called jets don't seem so obvious to me. Are these supposed to be the jets?

Posted: **Sat Jul 20, 2024 4:28 pm**

johnnydeep wrote: ↑Fri Jul 19, 2024 3:49 pm
VictorBorun wrote: ↑Fri Jul 19, 2024 2:39 pm
johnnydeep wrote: ↑Wed Jul 17, 2024 4:49 pm 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.
zoom in and see the jets of HH120 for all their noteworth
I don't know. The so-called jets don't seem so obvious to me. Are these supposed to be the jets?

hh120 jets.jpg

I went for something bigger than that. Like slash lines across this frame:

Posted: **Sat Jul 20, 2024 6:26 pm**

VictorBorun wrote: ↑Sat Jul 20, 2024 4:28 pm
johnnydeep wrote: ↑Fri Jul 19, 2024 3:49 pm
VictorBorun wrote: ↑Fri Jul 19, 2024 2:39 pm

zoom in and see the jets of HH120 for all their noteworth
I don't know. The so-called jets don't seem so obvious to me. Are these supposed to be the jets?

hh120 jets.jpg
I went for something bigger than that. Like slash lines across this frame:
Cometary Globules (2024 Jul 16) 3.jpg

I don't get it. This image looks to be no better than the one I clipped from.

Posted: **Sun Jul 21, 2024 1:10 am**

johnnydeep wrote: ↑Sat Jul 20, 2024 6:26 pm
VictorBorun wrote: ↑Sat Jul 20, 2024 4:28 pm
johnnydeep wrote: ↑Fri Jul 19, 2024 3:49 pm

I don't know. The so-called jets don't seem so obvious to me. Are these supposed to be the jets?

hh120 jets.jpg
I went for something bigger than that. Like slash lines across this frame:
Cometary Globules (2024 Jul 16) 3.jpg
I don't get it. This image looks to be no better than the one I clipped from.

Posted: **Sun Jul 21, 2024 12:54 pm**

VictorBorun wrote: ↑Sun Jul 21, 2024 1:10 am
johnnydeep wrote: ↑Sat Jul 20, 2024 6:26 pm
VictorBorun wrote: ↑Sat Jul 20, 2024 4:28 pm

I went for something bigger than that. Like slash lines across this frame:
Cometary Globules (2024 Jul 16) 3.jpg
I don't get it. This image looks to be no better than the one I clipped from.
Cometary Globules (2024 Jul 16) 4.jpg

oh, THOSE are what you're calling the jets?! I was thinking any jets would show only much closer to the progenitor star, and so I was concentrating my examination near the bright spot at the center.

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