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Thread: an internal mechanism for Tabby's star?

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    Default an internal mechanism for Tabby's star?



    Past items italicized. Scopes: Refractors: Orion ST80 (mods for white light solar), SV ED80 f7, Orion and SW 80 and 120 ED, Orion ED80T, Orion 120 f8.3, Tasco 30x30, Edmund 40; Newtonians: AT 8”f4, OC 8”f6.3, Z12 f5, self made 6” f9, Orion 10" f4.7, Orion XX14i; Catadioptrics: VMC110L, Intes MK66, Orion 102 MakCas f12.7, Celestron 9.25 SCT and 9.25 Edge. EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, TV Nagler, ES100s, Edmund Orthoscopics, Baader Hyperions. Mounts: Orion Sirius EQG, Star Seeker III, Celestron CG5, Vixen Porta II, Orion Atlas, Losmandy G11

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    Default Re: an internal mechanism for Tabby's star?

    Frankly I remain truly hopeful that we have an alien megastructure, preferably a Dyson Sphere under construction or Niven's Ringworld.

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    Default Re: an internal mechanism for Tabby's star?

    Quote Originally Posted by creekindian View Post
    Frankly I remain truly hopeful that we have an alien megastructure, preferably a Dyson Sphere under construction or Niven's Ringworld.
    It's completely ruled out. Such a structure would have more regularly symmetric dips not the asymmetric dips.
    Solrian likes this.
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    Default Re: an internal mechanism for Tabby's star?

    Quote Originally Posted by not_Fritz_Argelander View Post
    It's completely ruled out. Such a structure would have more regularly symmetric dips not the asymmetric dips.
    To be specific, an artificial structure would be opaque so all wavelengths of light would be blocked equally. However the dips in the light curve of Tabby's star have been shown to be wavelength dependent, characteristic of dust. Thus the alien megastructure is ruled out.
    Solrian, SpyderwerX and sketrip like this.
    Past items italicized. Scopes: Refractors: Orion ST80 (mods for white light solar), SV ED80 f7, Orion and SW 80 and 120 ED, Orion ED80T, Orion 120 f8.3, Tasco 30x30, Edmund 40; Newtonians: AT 8”f4, OC 8”f6.3, Z12 f5, self made 6” f9, Orion 10" f4.7, Orion XX14i; Catadioptrics: VMC110L, Intes MK66, Orion 102 MakCas f12.7, Celestron 9.25 SCT and 9.25 Edge. EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, TV Nagler, ES100s, Edmund Orthoscopics, Baader Hyperions. Mounts: Orion Sirius EQG, Star Seeker III, Celestron CG5, Vixen Porta II, Orion Atlas, Losmandy G11

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    Default Re: an internal mechanism for Tabby's star?

    This is quite interesting hypothesis. Looking forward to reading future observations on the star.
    Refractors: Antares 105 f/15, Bresser 102XL f/13.2, Celestron 102 f/6.5, 2-150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, Vixen SD115s f/7.7
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    Default Re: an internal mechanism for Tabby's star?

    Quote Originally Posted by Gabby76 View Post
    This is quite interesting hypothesis. Looking forward to reading future observations on the star.
    We discussed in more recent threads the fact that reddening of the light indicates dust rather than artificial structures. Since large sunspots groups ALSO redden (cooler local effective temperature) they aren't ruled out. But dust is now most likely for the dips.

    I'll not find the thread where we discussed the dust observations (the famous search function is daunting) but merely cite some articles that are more recent than the OP, OK?

    New Observations of "Most Mysterious Star in the Galaxy"

    https://www.jpl.nasa.gov/news/news.php?feature=6963

    https://www.sciencedaily.com/release...1013091951.htm
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    Past items italicized. Scopes: Refractors: Orion ST80 (mods for white light solar), SV ED80 f7, Orion and SW 80 and 120 ED, Orion ED80T, Orion 120 f8.3, Tasco 30x30, Edmund 40; Newtonians: AT 8”f4, OC 8”f6.3, Z12 f5, self made 6” f9, Orion 10" f4.7, Orion XX14i; Catadioptrics: VMC110L, Intes MK66, Orion 102 MakCas f12.7, Celestron 9.25 SCT and 9.25 Edge. EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, TV Nagler, ES100s, Edmund Orthoscopics, Baader Hyperions. Mounts: Orion Sirius EQG, Star Seeker III, Celestron CG5, Vixen Porta II, Orion Atlas, Losmandy G11

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    Default Re: an internal mechanism for Tabby's star?

    Thank you for the extra information nFA!
    Refractors: Antares 105 f/15, Bresser 102XL f/13.2, Celestron 102 f/6.5, 2-150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, Vixen SD115s f/7.7
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    The weakest link in the optical chain is the large nut located directly behind the eyepiece/ camera. - Gabrielle
    Ya gotta keep this Apo/Achro thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

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    Default Re: an internal mechanism for Tabby's star?

    I’ve always favored a source of intrinsic variability in the Star because of the randomness of the dips in output. The other explanations have seemed excessively implausible. Dust with no IR sig, comet “swarms”, etc... much more believable that it’s just a new type of variable. Less exciting perhaps, but much more plausible.
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    for my other "hobby"

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    Default Re: an internal mechanism for Tabby's star?

    Quote Originally Posted by MCox View Post
    I’ve always favored a source of intrinsic variability in the Star because of the randomness of the dips in output. The other explanations have seemed excessively implausible. Dust with no IR sig, comet “swarms”, etc... much more believable that it’s just a new type of variable. Less exciting perhaps, but much more plausible.
    The observed reddening during dips does indicate dust though. The absence/weakness of IR could indicate that the dust is distant and cold. Would need to have sensitivity data on the attempted IR detection to discuss.

    Still that only deals with the dips. I don't see an explanation for the long term variability having an origin in the dust. Most likely there will be surprises. There is no complete understanding yet. Except it's NOT aliens.

    Another known type of variable star R Cor Bor has irregular dips. Not saying that Tabby's is one. The mechanism is likely different, but.....

    https://en.m.wikipedia.org/wiki/R_Coronae_Borealis
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