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  2. Lemon battery - Wikipedia

    en.wikipedia.org/wiki/Lemon_battery

    A lemon battery is a simple battery often made for the purpose of education. Typically, a piece of zinc metal (such as a galvanized nail) and a piece of copper (such as a penny) are inserted into a lemon and connected by wires.

  3. While it does contain more iron than many vegetables such as asparagus, Swiss chard, kale, or arugula, it contains only about one-third to one-fifth of the iron in lima beans, chickpeas, apricots, or wheat germ. Additionally, the non-heme iron found in spinach and other vegetables is not as readily absorbed as the heme iron found in meats and fish.

  4. Biobattery - Wikipedia

    en.wikipedia.org/wiki/Biobattery

    Like any battery, bio-batteries consist of an anode, cathode, separator, and electrolyte with each component layered on top of another. Anodes and cathodes are the positive and negative areas on a battery that allow electrons to flow in and out. The anode is located at the top of the battery and the cathode is located at the bottom of the battery.

  5. Barium star - Wikipedia

    en.wikipedia.org/wiki/Barium_star

    Barium stars also show enhanced spectral features of carbon, the bands of the molecules CH, CN and C 2. The class was originally recognized and defined by William P. Bidelman and Philip Keenan. [1] Initially, after their discovery, they were thought to be red giants, but the same chemical signature has been observed in main-sequence stars [2 ...

  6. B(e) star - Wikipedia

    en.wikipedia.org/wiki/B(e)_star

    The designation results from combining the spectral class B, the lowercase e denoting emission in the spectral classification system, and the surrounding square brackets signifying forbidden lines. These stars frequently also show strong hydrogen emission lines, but this feature is present in a variety of other stars and is not sufficient to ...

  7. Semiregular variable star - Wikipedia

    en.wikipedia.org/wiki/Semiregular_variable_star

    IAU definition [1] GCVS code [2] GCVS definition [2] Standard stars SRa semi-regular variable giants of late spectral classes (M, C and S), which retain periodicity with comparative stability and possess, as a rule, small (less than 2 m.5) light-variation amplitudes. Amplitudes and forms of light curves are usually liable to strong variations ...

  8. Subgiant - Wikipedia

    en.wikipedia.org/wiki/Subgiant

    The term subgiant was first used in 1930 for class G and early K stars with absolute magnitudes between +2.5 and +4. These were noted as being part of a continuum of stars between obvious main-sequence stars such as the Sun and obvious giant stars such as Aldebaran, although less numerous than either the main sequence or the giant stars.

  9. S-type star - Wikipedia

    en.wikipedia.org/wiki/S-type_star

    The original definition of an S star was that the ZrO bands should be easily detectable on low dispersion photographic spectral plates, but more modern spectra allow identification of many stars with much weaker ZrO. MS stars, intermediate with normal class M stars, have barely detectable ZrO but otherwise normal class M spectra.

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