red dwarf Definition and 17 Threads

If our star, (or one just like it) had a red dwarf companion, what would it look like? I've got this about 1 million miles away from the sun. I understand that red dwarfs are not really red like a stoplight, but are more like the color of a dimmed incandescent lightbulb. But our sun in...

Recently, I’ve heard from Anton Petrov on YouTube that some tidally-locked planets around red-dwarf stars (such as TRAPPIST-1) have been suspected to flip around their own axis every once in a while — so that the former day side becomes the night side, and vice versa. This is presumed to happen...

I am considering writing a story that features aliens indigenous to a planet orbiting a red dwarf star. Even so, because of its proximity to the red dwarf, the planet's surface receives much more radiation than Earth's surface does. What is more, the planet has no moon to stabilize its...

I was reading about how red dwarf stars are typically flare stars. So if there were humanoids that were like us on an Earth-like planet in a such red dwarf system - i.e., and were accustomed to the temperature of Earth, etc. - would the flare heat up the planet to be too hot for life...

Hello. I was wondering if the any astronomers, professional or amateur, could help me with a few questions about red dwarf stars. The main query I have is the one heading this thread - what (or which) is the brightest red dwarf that can be seen from here on Earth? Associated questions on this...

I've been doing some thinking on a sci-fi story about a colony around a Red Dwarf Star. I understand that most planets around Red Dwarf Stars, at least in the habitable zone, would be tidally locked. I created another thread to ask about ways to maintain a planetary rotation. My main question...

All, A couple of questions about planets around Red Dwarf Stars: I'm imagining a planet around a Red Dwarf Star...think Trappist-1...and want to know how I can prevent tidal locking for an Earth-sized terrestrial planet in such a star's habitable zone...say, 1/50th to 1/20th of an AU from the...

Now, it's been said that red dwarfs are completely convective, therefore they can convert 100% of their hydrogen supply into helium. However, is this really practically true? One would think that at some point in its lifespan that there simply won't be enough hydrogen left to sustain a practical...

Blackbody radiation spectra of hot light sources ( stars in this case) should have the full visible light spectrum and still stars less massive than the Sun emit reddish light while stars more massive than the Sun emit blue light. How is the blackbody radiation spectrum altered by the star mass?

The interview: John Batchelor Show The scientific paper: https://www.nature.com/nature/journal/v544/n7650/full/nature22055.html[/PLAIN] ]Nature and ArXiv The basic facts: Star Name: LHS 1140 Constellation: Cetus the Whale Distance from Sun: 41 light-years Star type: Red dwarf (much...

Hi, I'm new to the forum and have an idea for a novel. I can't find anything on this question so I thought I'd sign up for a forum to ask. I'm not a scientist and lack much of the higher technical knowledge. Here's my question: Most planets in close orbits (they'd have to be to support liquid...

As a red dwarf star is donating material to a white dwarf until there is a nova. What happens to the red dwarf during the nova? Is there an increase in nucleosynthesis within the red dwarf due to its close proximity? If so, how would that change the periodicity and type of later novas? If you...

If we lived in a solar system with a red dwarf, and it had the same apparent size as the Sun, would it be harmful for our eyes to look at? If not, then how much closer would you have to get? Just curious, and I might use this info for fiction.

I was trying to calculate possible orbit of a potential exomoon of a hot Jupiter within habitable zone of a red dwarf. Everything (heat absorbed, reasonably within Hill sphere, far from Roche limit) seamed reasonable. However, I encountered one problem - hot Jupiter should be tidally locked. It...

Okay, I'm nervous. I feel a bit like I'm standing in front of an auditorium and am about to make a speech... I'm a fiction writer... Wait! Don't go yet! I'm one of these hillbilies who *needs* some help! I'm working on a science fiction bit and I do believe in research. I'm always...

Does the new estimate on the number of red dwarf stars in the universe suggest a different proportion of He/H? (current helium abundance estimate is 24%) Would it be lower since more mass would be tied up in low-mass stars (like red dwarfs) in which He/H<0.24.? If not, how many more times should...

Could it happen or is it very unlikely?