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37 questions Newest Active Bountied Unanswered More Filter Filter by No answers No accepted answer Has bounty Days old Sorted by Newest Recent activity Highest score Most frequent Bounty ending soon Trending Most activity Tagged with My watched tags The following tags: Apply filter Cancel 1 vote 0 answers 39 views

Determine the age of an open cluster (M41)

I'm currently conducting a photometric study of the M41 open cluster and have successfully built its Hertzsprung-Russell diagram. Now, I'd like to estimate the age of the cluster by fitting an ...

Sasha Gambazzi

asked Nov 11 at 21:37 1 vote 0 answers 22 views

Using Gaia Passbands with L_nu coordinates

I am trying to find the coordinates of my bundles of gas on the gaia ($G, G_{bp}-G_{rp}$) hr diagram. I have its spectrum in $\nu L_\nu$ coordinates. Thus far, my attempts have mainly been to ...

Berkin

asked Jul 15, 2023 at 6:54 2 votes 1 answer 106 views

Unusual amount of white dwarfs in star clusters in my analysis

I'm trying to plot H-R Diagrams of open clusters using data from Gaia DR3. My workflow is something like this: Plot apparent magnitude vs log(distance) in pc. An overdensity would indicate the ...

Ambica Govind

asked Jul 8, 2023 at 6:36 1 vote 0 answers 67 views

How do nuJ(nu) units work?

I'm working with (Nublado) Cloudy, which is essentially a spectral modelling tool for stellar matter. Using the software, I model my own stellar object and obtain its continuum. According to Hazy, ...

Berkin

asked Jun 27, 2023 at 8:26 3 votes 1 answer 71 views

How do you use Gaia Passbands to find Gbp-Grp Coordinates?

I've never used Gaia passbands, or any type of passbands before for that matter. I have a theoretical model of a stellar object, and its corresponding emissions as a function of wavelength. I'd like ...

Berkin

asked Jun 23, 2023 at 7:05 5 votes 2 answers 517 views

Difference in HR diagram clusters

I was wondering what the difference in an HR-diagram would be between an open and globular cluster. I've trying to compare both by looking up diagrams online, but can't find diagrams with same axes. I ...

Andromeda

asked Dec 14, 2022 at 10:46 3 votes 1 answer 406 views

Is there a general way to plot the evolutionary track of a star on HR diagram?

HR diagrams for stars are available on the internet and it is also easy to plot this for thousands of stars from their absolute magnitude and color index values (obtainable from any catalog). However, ...

Abdul Muhaymin -Free Palestine

asked Jul 27, 2022 at 18:29 2 votes 1 answer 537 views

What would the HR diagram look like if the axes were scaled linearly instead of logarithmically?

The Hertzsprung-Russell diagram typically has its axes scaled logarithmically, and with good reason. The hottest stars are about 20 times as hot as the coldest ones (at least at the surface), and the ...

zucculent

1,768

asked Aug 22, 2021 at 21:23 5 votes 1 answer 355 views

Which star has the faintest absolute magnitude (largest magnitude) yet is still visible with the naked eye from Earth (either hemisphere)?

I am thinking about the Bright Star Catalogue and how it is not a good representation of a typical population of stars. The Bright Star Catalogue includes all the visible stars from Earth when viewing ...

Astroturf

1,111

asked Aug 2, 2021 at 16:43 3 votes 0 answers 293 views

Why do blue horizontal branch stars turn downwards on the HR diagram as opposed to red horizontal branch stars which remain fairly constant?

Horizontal branch stars (HB) burn helium at their cores. Red horizontal branch (RHB) stars experience an increase in temperature while their radii decrease so their luminosity remains somewhat ...

Astroturf

1,111

asked Jul 27, 2021 at 20:23 1 vote 0 answers 74 views

What is the wiggle in the AGB branch?

In many HR diagrams, the asymptotic giant branch includes a wiggle. I thought that these are thermal pulses, but now I realise there are many thermal pulses, and I find only one wiggle. The wiggle ...

zabop

asked May 29, 2021 at 15:29 5 votes 1 answer 182 views

Is a branch on HR diagram a line formed by stars in the same evolutionary phase, or the evolutionary track of an individual star?

Here is a HR diagram from Wikipedia, in the well-known form: Here is another one from the Stellar evolution article: I know that when stars leave the main sequence, they go to the giant branch ...

zabop

asked May 28, 2021 at 19:17 1 vote 1 answer 486 views

Graphing the evolution of stars on an HR diagram with timesteps

I have found countless images regarding the evolution of stars, plotted on an HR Diagram, like so (found on Wikipedia): Although this displays the time in each stage, it does not include any points ...

WarpPrime

6,744

asked May 15, 2021 at 0:22 1 vote 1 answer 265 views

HR diagram x-axis (color) and redshift?

I've read several articles and watched some videos on the HR diagram, but no-one seems to mention the effect of redshift on the color of a star. Is there some calibration step that needs to be applied ...

captcha

asked Apr 28, 2021 at 1:31 1 vote 1 answer 2k views

Is there a formula to calculate any star mass from Luminosity, Radius, and/or Temperature (K)? [duplicate]

I know there is the Mass-Luminosity relationship, but I am wondering if there is a more accurate formula I can use based on the data points I have generated: Absolute Magnitude (based on class and ...

TyCobb

asked Apr 14, 2021 at 2:41 15 30 50 per page 1 2 3 Next

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stellar-evolution × 16 star × 14 luminosity × 4 red-giant × 4 observational-astronomy × 4 gaia × 4 stellar-astrophysics × 3 age × 3 main-sequence × 3 star-cluster × 3 spectroscopy × 3 amateur-observing × 2 redshift × 2 mass × 2 units × 2 data-analysis × 2 globular-clusters × 2 stellar-classification × 2 color-index × 1 galactic-evolution × 1 red-supergiant × 1 variable-star × 1 mathematics × 1 definition × 1 absolute-magnitude × 1 more related tags

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Newest 'hr-diagram' Questions - Astronomy Stack Exchange

Determine the age of an open cluster (M41)

Using Gaia Passbands with L_nu coordinates