Tips on Pulsars

[Celestial_Planets]

I want tips on how to create a pulsar, with pulsar jets and a pulsar field, like PSR J1210-6550.

[Malenfant]

Maybe if you asked, instead of demanded, you may have more luck getting some. And if you show that you've at least made some effort to try and get somewhere with it yourself that would also make it a bit more likely for people to help.

Plus, do you even know how to make an ssc or stc file?

[Celestial_Planets]

OOPS!! I should have put a question mark "?" instead of a period. "."

Only 28 minutes and already I messed up. Plus, I know how to make STC and SSC files. Besides, all I need is help.

I don't know how to make any pulsar fields or pulsar jets. Could you please help me? Could any of you help me? Will an expert on pulsars help me? Will I be able to help myself?

Here's my own STC file

Example of an STC file:

Code: Select all

"My Star"
{
   RA 269.148070
   Dec -30.539412
   Distancen 7900       # to give known apparent magnitude
   SpectralType "O" # from estimated mass and radius
   AbsMag 0.3         # from spectral class
   Radius 28525000
}


Here's my own SSC File

Example of an SSC File:

Code: Select all

#########################
# My Star.ssc
#########################
"b" "My Star" {
   Texture "venuslike.jpg"
   Radius 64000
   EllipticalOrbit
   {   Period 5.8
      SemiMajorAxis 2.5
   }
}
#########################


Note: This SSC File is under construction

If anyone has some information on how to create a pulsar, please post here. Can anyone help me create a pulsar with a pulsar field and pulsar jets?

[Malenfant]

Ok, it's just when people show up out of the blue saying "oi, help me!" with nothing to indicate that they've at least attempted what they're asking about, it's a bit off-putting.

The obvious thing to ask is whether you've downloaded Cham's pulsar addon (you can find that here: http://www.celestiaproject.net/forum/viewtopic.php?t=10022 ). The best way to learn is to take apart something that someone else has done and see how it works and try changing bits and seeing what happens.

[Cham]

Yep, that's the best way I know to learn how to make addons. Study one already made for you, look in its SSC and STC files, and learn how to use a modeler (with 3ds export). Try modifying the SSC to see the effect (and make a back up of the original, of course). Experiment with the files, and be patient.

Personaly, I learned how to make addons by studying the addons of my master : Rassilon. My own pulsars and black holes addons were inspired by Rassilon's pulsars (notably PSR 1257+12, which is pretty tough to find, unfortunately).

[Celestial_Planets]

I think I got this nailed down.

In the fourth reply of this post, you posted that I should ask whether I downloaded Cham's Pulsar Add-on. I did download Cham's Pulsar Addon, way before I even registered in the forum. I tried to make a binary star system, but it failed. I will try making a binary system again.

[Malenfant]

Yeah, trying to jump straight in and make a pulsar is a bit much... try mastering the basics first - binary systems can be a bit fiddly on their own. Once you've got those nailed down then you can try tweaking that to become a pulsar eventually. Small steps!

[Chuft-Captain]

Small steps!

Oh, very funny Dr Arroway!

[Celestial_Planets]

I created a binary star system. It's called 64 Huns. 64 Huns is not a real name. It's a made up name.

Just copy the contents of 64 Huns into your notepad editor and save it as an STC file.

Heres the contents of 64 Huns.

Code: Select all

Barycenter "64 Huns"
{
   RA 24.755529
   Dec -17.950278
   Distance 729.40
}

"64 Huns A"
{
   OrbitBarycenter "64 Huns"
   SpectralType "O7"
   AppMag 12.54
   Radius 23000000

   EllipticalOrbit {
      Period          0.0000004
      SemiMajorAxis   3.87    # mass ratio 65.8:65.8
      Eccentricity    0.62
      Inclination   101.3
      AscendingNode   159.5
      ArgOfPericenter 39.7
      MeanAnomaly     21.3
   }
}

"64 Huns B"
{
   OrbitBarycenter "64 Huns"
   SpectralType "M7"
   AppMag 12.99
   Radius 30000000

   EllipticalOrbit {
      Period          0.0000004
      SemiMajorAxis   2.61   # mass ratio 65.8:65.8
      Eccentricity    0.62
      Inclination   101.3
      AscendingNode   159.5
      ArgOfPericenter 219.7
      MeanAnomaly     21.3
   }
}


After that, got to the cel://url here:

cel://Follow/64Huns/2006-10-13T22:25:26 ... 967&lm=359

Hope you like my binary star system.

[Celestial_Planets]

Here's and update on 64 Huns. 64 Huns A and B orbit their common barycenter in about 13 seconds. Here's the cel://url here

Updated cel://url:

cel://Follow/64Huns/2006-10-14T14:12:10 ... 967&lm=359

Hope you like this updated binary system.

[Malenfant]

The orbital syntax looks correct, but the numbers are nonsensical. You can't have O7 stars that are 0.412 solar luminosities, or M7 giants that have 0.272 solar luminosities.

The orbital period is far too short too - if they're orbiting every 13 seconds and have a masses of 65.8 solar masses, then they should have an orbital distance of 0.0003 AU (45000km), which is a lot smaller than their radii.

[Celestial_Planets]

Here's an update on the binary stars. I made 64 Huns A and B's radius 100 km for 64 Huns A and 150 km for 64 Huns B.

Replace the previous version of 64 Huns with the new version shown here:

Code: Select all

Barycenter "64 Huns"
{
   RA 24.755529
   Dec -17.950278
   Distance 729.40
}

"64 Huns A"
{
   OrbitBarycenter "64 Huns"
   SpectralType "WC"
   AppMag 18.00
   Radius 100

   EllipticalOrbit {
      Period          0.0000004
      SemiMajorAxis   0.0003    # mass ratio 65.8:65.8
      Eccentricity    0.62
      Inclination   101.3
      AscendingNode   159.5
      ArgOfPericenter 39.7
      MeanAnomaly     21.3
   }
}

"64 Huns B"
{
   OrbitBarycenter "64 Huns"
   SpectralType "WC"
   AppMag 18.00
   Radius 150

   EllipticalOrbit {
      Period          0.0000004
      SemiMajorAxis   0.0003   # mass ratio 65.8:65.8
      Eccentricity    0.62
      Inclination   101.3
      AscendingNode   159.5
      ArgOfPericenter 219.7
      MeanAnomaly     21.3
   }
}


After that, go to the cel://url shown here

cel://Follow/64Huns/2006-10-14T18:02:50 ... 34807&lm=2

This may be the final version of the binary system 64 Huns. If I have made any mistakes, please post them and I will know.

[Malenfant]

Are you actually looking up values here, or just making them up? If the stars
are white dwarfs, then they should be about 10000 km in radius. If they're
pulsars/neutron stars, they should be 10-15 km in radius. There aren't any
stars with radii in the hundreds of km.

Also, you can't get neutron stars that are 65 solar masses. I think the upper limit for them is around 8 solar masses.

[Celestial_Planets]

OOPS!!

I made that up, but I'm sure that this time, I'll get this right.

[Tech Sgt. Chen]

Actually, (I think), the theoretical, upper mass limit for Neutron Stars is no greater than 3 Solar masses. I don't think that any of the current (confirmed) Neutron Stars exceed 2 SM.
Celestial_Planets, try Googling some research words such as: Pulsars, Neutron Stars, White Dwarfs and Black Holes. You'll find a wealth of information for your projects.

[Malenfant]

http://www.journals.uchicago.edu/ApJ/jo ... /5329.html

You're right - I dunno where I got the 8 solar mass limit from ... the paper above says it's about 2.9 solar masses.

Maybe I was thinking about progenitor star mass?

[Celestial_Planets]

Tech Sgt. Chen, I think that you are right. The Maximum solar mass of a neutron star is 2.9 Solar Masses.

Anyway, here's an update on the contents of 64 Huns.

Code: Select all

Barycenter "64 Huns"
{
   RA 24.755529
   Dec -17.950278
   Distance 729.40
}

"64 Huns A"
{
   OrbitBarycenter "64 Huns"
   SpectralType "Q"
   AppMag 18.00
   Radius 10

   EllipticalOrbit {
      Period          0.0000004
      SemiMajorAxis   0.0003    # mass ratio 2.4:2.4
      Eccentricity    0.62
      Inclination   101.3
      AscendingNode   159.5
      ArgOfPericenter 39.7
      MeanAnomaly     21.3
   }
}

"64 Huns B"
{
   OrbitBarycenter "64 Huns"
   SpectralType "Q"
   AppMag 18.00
   Radius 10

   EllipticalOrbit {
      Period          0.0000004
      SemiMajorAxis   0.0003   # mass ratio 2.4:2.4
      Eccentricity    0.62
      Inclination   101.3
      AscendingNode   159.5
      ArgOfPericenter 219.7
      MeanAnomaly     21.3
   }
}


After that, go to this cel://url here:

cel://Follow/64Huns/2006-10-15T16:53:04 ... 83&lm=1386

If there's any mistakes I've made, pleast post them and I will know.

[Tech Sgt. Chen]

Malenfant Wrote:

You're right - I dunno where I got the 8 solar mass limit from ... the paper above says it's about 2.9 solar masses.

I actually have seen 1 or 2 papers (or maybe more) suggesting the upper mass limit for Neutron Stars as 8 SM. They were from pretty sound sources (a University or two) though, the majority of references I've seen elsewhere assert the mass limit at 3. I have no idea why the formers concluded a mass limit of 8 since, admittedly, I didn't read those studies in their entirety. They may have been derived from older data.

[Celestial_Planets]

Here are the screenshots of 64 Huns





What do you think of my work?

P.S. The second image shows both views, 64 Huns A and 64 Huns B.

[Celestial_Planets]

2 1/2 days and still no replies. They don't like the work I do.